Glenn Duff

Title:Professor/Superintendent
Major Field of Interest: Animal Nutrition
Email:glennd@nmsu.edu
Office Phone:575-374-2566
Office Location:Clayton Livestock Research Center

Education:

New Mexico State University, Department of Animal and Range Sciences, Las Cruces, NM Doctor of Philosophy January 1991
Major Area: Animal Nutrition, Related Area: Animal Physiology
Research Tool: Experimental Statistics
Dissertation Title: Effects of continuous versus daily rotational use of lasalocid and monensin on in vitro fermentation and blood clinical chemistry profiles in beef cattle fed a 90% concentrate diet.
Major Professor: Dr. Michael Galyean

University of Arkansas, Department of Animal and Poultry Science, Fayetteville, AR Master of Science, August 1988
Major Area: Animal Physiology
Thesis title:Effect of energy intake on selected blood parameters in prepubertal Holstein heifers.
Major Professor: Dr. Jack Perkins

Northwest Missouri State University, Maryville, MO, Bachelor of Science, May 1986
Animal Science and Dairy Science

Iowa Western Community College, Council Bluffs, IA, Associates of Arts May, 1981
General Studies

Employment:

Department Head and Professor, New Mexico State University, Department of Animal and Range Sciences, Las Cruces. July 2015 to 2017.

Department Head and Professor, Montana State University, Department of Animal and Range Sciences, Bozeman. December 2015 to July 2015.

Interim Dean and Director, College of Agriculture/Agricultural Experiment Station, Montana State University, Bozeman. September 2013 to December 2015.

Department Head and Professor, Montana State University, Department of Animal and Range Sciences, Bozeman. August 2010 to August 2013

Professor, Ruminant Nutritionist, The University of Arizona, Department of Animal Sciences, College of Agriculture and Life Sciences, Tucson. July 2009 to August 2010.

Associate Professor, Ruminant Nutritionist, The University of Arizona, Department of Animal Sciences, College of Agriculture and Life Sciences, Tucson. August 2001 to July 2009.

Assistant Professor of Animal Science and Superintendent, New Mexico State University, Clayton Livestock Research Center, Clayton, NM. September 1996 to August 2001.

Acting Superintendent and College Assistant Professor of Animal Science, New Mexico State University, Clayton Livestock Research Center, Clayton, NM. April 1996 to September 1996.

Postdoctoral Research Associate. New Mexico State University, Clayton Livestock Research Center, Clayton, NM. October 1994 to April 1996.

Sales Nutritionist. Farr Better Feeds, Garden City, KS. October 1993 to October 1994.

Research Specialist. University of Arkansas, Fayetteville, AR. August 1991 to October 1993.

Postdoctoral Research Associate. New Mexico State University, Clayton Livestock Research Center, Clayton, NM. January 1991 to August 1991.

Graduate Research and Teaching Assistant. New Mexico State University, Las Cruces, NM. August 1988 to December 1990.

Graduate Research Assistant. University of Arkansas, Fayetteville, AR. August 1986 to August 1988.

Service/Outreach:

Local/State
As a member of the Southwest Nutrition and Management Conference Committee, actively involved in planning and conducting the annual conference every year since 2001. Attendance has increased every year to approximately 400 registrants.
Arizona Cattle Feeders' Association. - Affiliate Member
Presented "Feed Yard Research Issues" to the cattle feeders. The focus of the presentation was an overview of current and pending research projects to further improve health and performance of feedlot cattle. 2002

Education committee meeting at summer conference 2002.

Joint Arizona/California Cattle Feeders' meeting presented information on upcoming research for Holstein steers. 2006.

Arizona National Livestock Judging Contest
Served as announcer for Collegiate Judging Contest.
2001; 2002; 2003; 2004; 2005; 2008, 2009. 2010.

Community Service

Clayton Rotary Club August 1996 to August 2001

The Rotary Club of Tucson Sunset (Paul Harris Fellow) December 2001 to August 2010.
Active participant in Christmas Gift Basket Program to provide gifts and food for underprivileged families in Tucson.
Chaired committee for Community Service - Program included Organ Donor Volunteers from the club. Ongoing project.
Member Constitution and By-Laws Committee - Updated club constitution and by-laws.
Bulletin Editor 2002
Board of Directors (Club Service) 2004 - 2005
Sergeant at Arms 2005 - 2006
President-Elect 2006 - 2007
President 2007 - 2008
Bozeman Noon Rotary Club
August 2010 to May 2011
Resigned due to conflicts with courses taught

Las Cruces Rotary Club September 2015 to Present

Youth Supporters Clayton NM 1996 to 1999
Raised money for scholarships and responsible for hosting annual 4th of July Rodeo

National/International
American Society of Animal Science
Editorial Board - 2000-2003
Section Editor - Applied Animal Science 2002-2004
Associate Editor - Ruminant Nutrition 2004-2005
Animal Management Award Committee 2002-2003; 2005-2006, 2006-2007, 2009-2010
American Feed Industry Association (AFIA) Ruminant Nutrition Award Committee 2004
Western Section American Society of Animal Science
Beef Symposium Committee 2005-2006; 2006-2007
Advising and Coordinating Committee
Member 2008-2010
Chair 2009-2010
Executive Committee 2009-2010
Secretary/Treasurer 2010-2011
President Elect 2011-2012
President 2012-2013
Past President 2013-2014

American Registry of Professional Animal Scientist (ARPAS)
Editorial Board 2002 - Present
Program Committee 2006 - 2007
Sponsorship Committee 2013-1014

External Peer Review for Promotion and Tenure
New Mexico State University 2006
Texas A&M University 2008
New Mexico State University 2011
University of Arkansas 2012
Montana State University 2013

United States Department of Agriculture (USDA)
USDA Cooperative State Research Education and Extension Service (CSREES) Multicultural Alliance Unit 1890 Institution
Peer Review Panel for the 1890 Institution Teaching and Research. Capacity Building Grants Program for Fiscal Year 2003. April 14 - 17, 2003, Washington, DC.

Ad hoc Peer Review for fiscal year 2004 and 2005. 1890 Institution Teaching and Research Capacity Building Grants Program.

USDA Small Business Innovation Research Program (SBIR)
Department of Agriculture's Small Business Innovation Research Program. Ad hoc Reviewer for fiscal years 2006 and 2007

Dairy Calf Heifer Raisers Association
Program Committee for annual meeting Tucson, AZ March 2009

Sultan Qaboos University, College of Agricultural and Marines Sciences, Sultanate of Oman, Muscat, Oman.
External Examiner May 19 - 29, 2005 and May 17 - 27, 2006.
Evaluated the Department of Animal and Veterinary Sciences with the mission of assessing upper division undergraduate courses, meet undergraduate students and assess their performance and evaluate the Department of Animal and Veterinary Sciences M.S. program. For the 2006 trip, mission was to examine select 2000 and 3000 level courses and assess their standards and grading; meet students and assess their standards and performance in general; and advise the department on new degree plans.

United Arab Emirates University
External Referee Assignment. Reviewed research grant application titled "Development of sustainable salt tolerant forages for sheep & goat production" May 2002.

Animal - An International Journal of Animal Bioscience
Ad-hoc reviewer for journal

Departmental Committees
Whenever asked, participated on departmental committees at the University of Arizona. Undergraduate/Scholarship Committee 2006 - 2010
Graduate Committee - 2001 - 2004
Chaired committee on a Master of Science - non-thesis degree
Beef Steering Committee 2001 - 2002
Chair 2002 - 2008
Southwest Nutrition and Management Committee
Co-Chair 2002 - 2010
Internal Peer Review for faculty APROL (Annual Performance Report)
Calendar years 2003, 2004, 2005, 2006
Search Committees
Chair - Farm Manager - Feedlot. 2004
Chair Search Committee Undergraduate Coordinator. 2005
Chair Search Committee - Animal Growth and Physiology Faculty position. 2006
Dairy Extension Faculty position 2002 and 2006
Chair Faculty Spousal Hire 2006
Undergraduate Coordinator 2007
Undergraduate Advisor, Instructor, Livestock Judging Coach 2009-2010
Seminar Committee 2002 - 2005
Faculty Supervisor - University Feed Yard
Faculty Supervisor - Nutrition Laboratory

Department of Animal Sciences Promotion and Tenure Committee
2006 - 2007
Campus Agriculture Center Improvements 2006 - 2010
Faculty Supervisor Collegiate Cattle Growers' Association 2005 - 2010
Web Site Committee 2009-2010

College of Agriculture and Life Sciences Committees
University of Arizona
Farm Animal Care Committee 2001 -2010
College Curriculum Committee 2004 - 2010
Chair 2005 - 2010
College Teaching Accountability Committee
Chair 2007 - 2008
Post-tenure Review Committee 2007 - 2009
Vice-chair 2008
Chair 2009

The University of Arizona Committees
Undergraduate Council 2007 - 2010
Chair Academic Programs Subcommittee 2007 - 2010
Graduate Academic Programs Committee 2008 - Present

Montana State University Accomplishments
DEAL Program
Developing Excellence in Academic Leadership program for Montana State University. This program is designed for leaders and emerging leaders. The cohort is comprised of 25 campus leaders and each participant has budgetary and personnel management responsibilities in their program. Besides addressing the key challenges, my participation in the program has allowed the opportunity to meet key administrators at Montana State University.

LEAD 21 Program
Participated in the first and second session for LEAD 21. This program is designed for leaders and emerging leaders in the Land-Grant system. Besides addressing the key challenges, my participation in the program has allowed the opportunity to network with personnel from across the country. First session focused on self-evaluation and 360 feedback. Second session focused on change.

Participated in several university committees as interim dean including DEAL program steering committee. Served on a committee to deal with budget deficit in the Vice President for Research, on a university wide scholarship committee, and on various councils (President's Council, Dean's Council, etc).

Publications/Creative Activity (Published or Accepted)
* Indicates work based primarily on studies completed as a graduate student.
** Indicates corresponding authorship for G. C. Duff.
By convention, if G. C. Duff is not first author, authorship is listed according to contribution to the research project.

Book Chapters
Galyean, M. L., and G. C. Duff. 1998. Feeding growing-finishing beef cattle. In: R. O. Kellems and D. C. Church (Eds.) Livestock Feeds and Feeding (4th Ed.). pp 262-280. Prentice-Hall, Englewood Cliffs, NJ. (Review)

Galyean, M. L., and G. C. Duff. 2002. Feeding growing-finishing beef cattle. In: R. O. Kellems and D. C. Church (Eds.). Livestock Feeds and Feeding (5th Ed.). pp 361-380. Prentice-Hall, Upper Saddle River, NJ. (Review)

Duff, G. C., and C. R. Krehbiel. 2008. Feeding growing-finishing beef cattle. In R. O. Kellems, Ed. Livestock Feeds and Feeding (6th Ed.). Prentice-Hall, Upper Saddle River, NJ. (Review)

Duff, G. C. 2007 through 2009. Beef Nutrition and Health: Dietary nutrient allowances for beef cattle. T. Lundeen, ed. Feedstuffs Volumes 79 to 81 (Review)

Duff, G. C. and J. D. Allen. 2010 through 2015. Beef Nutrition and Health: Dietary nutrient allowances for beef cattle. T. Lundeen, ed. Feedstuffs Volumes 82 to 87 (Review)

Refereed Journal Articles

*Duff, G. C., A. L. Goetsch, K. M. Landis, A. C. Hardin, S. R. Stokes, and Z. B. Johnson. 1988. Mixing or alternating dietary nitrogen sources and performance of wether lambs. Can. J. Anim. Sci. 68:569-572.

*Bachman, S. E., M. L. Galyean, D. M. Hallford, C. E. Heird, and G. C. Duff. 1991. A note on the influence of oestradiol-17 - implants on serum hormone and metabolite concentrations in response to an epinephrine challenge in lambs. Anim. Prod. 55:295-298.

*Kattnig, R. M., A. J. Pordomingo, A. G. Schneberger, G. C. Duff, and J. D. Wallace. 1992. Influence of saline water on intake, digesta kinetics, and serum profiles of steers. J. Range Manage. 45:514-518.

Galyean, M. L., K. J. Malcolm, and G. C. Duff. 1992. Performance of feedlot steers fed diets containing laidlomycin propionate or monensin plus tylosin, and effects of laidlomycin propionate concentration on intake patterns and ruminal fermentation in beef steers during adaptation to a high-concentrate diet. J. Anim. Sci. 70:2950-2958.

Kellogg, D. W., E. E. Hatfield, G. C. Duff, and Z. B. Johnson. 1993. Effect of replacing dried skim milk with peptone concentrate, whey, and dextrose in milk replacer on weight gain and feed efficiency of Holstein calves. Prof. Anim. Sci. 9:114.

*Duff, G. C., M. L. Galyean, M. E. Branine, and D. M. Hallford. 1994. Effects of lasalocid and monensin plus tylosin on serum clinical chemistry profiles for beef steers fed a 90% concentrate diet. J. Anim. Sci. 72:1049-1058.

Malcolm-Callis, K. J., M. L. Galyean, and G. C. Duff. 1994. Effects of dietary supplemental protein sources and a Pasteurella haemolytica toxoid on performance and health of newly received calves. Agri-Practice 15:22-28.

*Duff, G. C., M. L. Galyean, and M. E. Branine. 1995. Effects of adaptation to lasalocid and monensin on in vitro fermentation of prairie hay. Can. J. Anim. Sci. 75:417-423.

Duff, G. C., A. L. Goetsch, K. K. Park, D. L. Galloway, Sr., M. Rinne, and A. R. Patil. 1995. Feed intake and digestion by Holstein steers consuming low-protein forage supplemented with different nitrogen sources. J. Appl. Anim. Res. 7:115-128.

*Duff, G. C., M. L. Galyean, and M. E. Branine. 1995. Effects of adaptation to lasalocid, monensin, or a daily rotation of lasalocid and monensin on in vitro fermentation of a 90% concentrate diet. Can. J. Anim. Sci. 75:129-134.

** Duff, G. C., M. L. Galyean, and K. J. Malcolm-Callis. 1996. Intake and ruminal fermentation by beef steers consuming prairie hay with supplements containing combinations of corn, soybean hulls, soybean meal, and urea. J. Appl. Anim. Res. 9:1-16.

Guthrie, M. J., M. L. Galyean, K. J. Malcolm-Callis, and G. C. Duff. 1996. Roughage source and level in beef cattle finishing diets. Prof. Anim. Sci. 12:192-198.

Brown, M. S., M. L. Galyean, G. C. Duff, D. M. Hallford, and S. A. Soto-Navarro. 1998. Effects of degree of processing and nitrogen source and level on starch availability and in vitro fermentation of corn and sorghum grain. Prof. Anim. Sci. 14:83-94.

Richards, J. B., D. M. Hallford, and ** G. C. Duff. 1999. Serum luteinizing hormone, testosterone, and thyroxine and growth responses of ram lambs fed locoweed (Oxytropis sericea) and treated with vitamin E/selenium. Theriogenology 52:1055-1066.

Brown, M. S., D. M. Hallford, M. L. Galyean, C. R. Krehbiel, and G. Duff. 1999. Effect of ruminal glucose infusion on dry matter intake, urinary nitrogen composition, and serum metabolite and hormone profiles in ewes. J. Anim. Sci. 77:3068-3076.

Bryant, T. C., J. D. Rivera, M. L. Galyean, G. C. Duff, D. M. Hallford, and T. H. Montgomery. 1999. Effects of dietary level of ruminally protected choline on performance and carcass characteristics of finishing beef steers and on growth and serum metabolites in lambs. J. Anim. Sci. 77:2893-2903.

Galyean, M. L., L. J. Perino, and G. C. Duff. 1999. Interaction of cattle health/immunity and nutrition. J. Anim. Sci. 77:1120-1134.

Frank, G. H., and G. C. Duff. 2000. Effects of tilmicosin phosphate, administered prior to transport or at time of arrival, and feeding of chlortetracycline, after arrival in a feedlot, on Mannheimia haemolytica in nasal secretions of transported calves. Am. J. Vet. Res. 61:1479-1483.

Malcolm-Callis, K. J., ** G. C. Duff, S. A. Gunter, E. B. Kegley, and D. A. Vermeire. 2000. Effects of zinc levels and source on performance, carcass characteristics, and serum parameters in finishing beef steers. J. Anim. Sci. 78: 2801-2808.

Brown, M. S., C. R. Krehbiel, G. C. Duff, M. L. Galyean, D. M. Hallford, D. A. Walker. 2000. Effect of degree of corn processing on urinary nitrogen composition, serum metabolite and insulin profiles, and performance by finishing steers. J. Anim. Sci. 78:2464-2474.

Soto-Navarro, S. A., C. R. Krehbiel, G. C. Duff, M. L. Galyean, M. S. Brown, and R. L. Steiner. 2000. Influence of feed intake fluctuation and frequency of feeding on nutrient digestion, digesta kinetics, and ruminal fermentation profiles in limit-fed steers. J. Anim. Sci. 78:2215-2222.

Soto-Navarro, S. A., ** G. C. Duff, C. R. Krehbiel, M. L. Galyean, and K. J. Malcolm-Callis. 2000. Influence of feed intake fluctuation, feeding frequency, time of feeding, and rate of gain on performance by limit-fed steers. Prof. Anim. Sci. 16:13-20.

** Duff, G. C., K. J. Malcolm-Callis, D. A. Walker, M. W. Wiseman, M. L. Galyean, and L. J. Perino. 2000. Effects of intranasal versus intramuscular modified live vaccines and vaccine timing on health and performance by newly received beef cattle. Bovine Practitioner 34(1):66-71.

** Duff, G. C., K. J. Malcolm-Callis, D. A. Walker, M. W. Wiseman, and D. M. Hallford. 2000. Effects of pre-shipping versus arrival medication with tilmicosin phosphate and feeding chlortetracycline on health and performance of newly-received beef cattle. J. Anim. Sci. 78:267-274.

Ralphs, M. H., J. D. Graham, G. Duff, B. L. Stegelmeier, and L. F. James. 2000. Impact of locoweed poisoning on grazing steer weight gain. J. Range Manage. 53:86-90.

Gunter, S. A., K. J. Malcolm-Callis, G. C. Duff, and E. B. Kegley. 2001. Performance of growing steers supplemented with zinc pre- and post-shipping to the feedlot. Prof. Anim. Sci. 17:280-286.

Mikus, J. H., ** G. C. Duff, C. R. Krehbiel, D. M. Hallford, D. A. Walker, J. D. Graham, and M. H. Ralphs. 2001. Effects of an estradiol implant on locoweed consumption, toxicity, and recovery in growing beef steers. Prof. Anim. Sci. 17:109-114.

Ralphs, M. H., F. D. Provenza, J. A. Pfister,. D. Graham, G. C. Duff, and G. Greathouse. 2001. Conditioned food aversions: From theory to practice. Rangelands 23:14-18.

Fent, G. M., R. W. Fulton, J. T. Saliki, S. L. Caseltine, H. D. Lehmkuhl, A. W. Confer, C. W. Purdy, R. E. Briggs, R. W. Loan, and G. C. Duff. 2002. Bovine adenovirus-7 infections in postweaning calves. Am. J. Vet. Res. 63:976-978.

** Duff, G. C., M. H. Ralphs, D. A. Walker, J. D. Graham, J. D. Rivera, and L. F. James. 2002. Grazing behavior of Hereford, Charolais, or Brangus steers on locoweed-infested pastures. Prof. Anim. Sci. 18:33-37.

Rivera, J. D., ** G. C. Duff, M. L. Galyean, D. A. Walker, and G. A. Nunnery. 2002. Effects of supplemental vitamin E on performance, health, and humoral immune response of beef cattle. J. Anim. Sci. 80:933-941.

Frank, G. H., R. E. Briggs, G. C. Duff, R. W. Loan, and C. W. Purdy. 2002. Effects of pre-transit vaccination and arrival medication with florfenicol on the health of transported steers and the presence of Mannheimia haemolytica organisms in nasal secretions. Am. J. Vet. Res. 63:251-256.

Beck, P. A., S. A. Gunter, G. C. Duff, K. J. Malcolm-Callis, D. A. Walker, and E. B. Kegley. 2002. Performance of steers supplemented with copper pre- and(or) post-shipping to the feedlot. Can. J. Anim. Sci. 82:87-93.

Fulton, R. W., J. F. Ridpath, J.T. Saliki, R. E. Briggs, A. W. Confer, L. J. Burge, C. W. Purdy, R. W. Loan, G. C. Duff, and M. E. Payton. 2002. Bovine viral diarrhea virus (BVDV) 1b: Predominant BVDV subtype in calves with respiratory disease. Can. J. Vet. Res. 66:181-190.

Choat, W. T., C. R. Krehbiel, M. S. Brown, G. C. Duff, D. A. Walker, and D. R. Gill. 2002. Effects of restricted versus conventional dietary adaptation on feedlot performance, carcass characteristics, site and extent of digestion, digesta kinetics and ruminal metabolism. J. Anim. Sci. 80:2726-2739.

** Duff, G. C., M. L. Galyean, and K. J. Malcolm-Callis. 2002. Effects of proportions of steam-flaked corn and grain sorghum and switching grain sources during the finishing period on performance and carcass characteristics of beef steers. Prof. Anim. Sci. 18:387-394.

** Duff, G. C., B. D. Hunsaker, A. C. Anderson, J. D. Roder, and D. A. Walker. 2003. Florfenicol concentration in serum of beef cattle fed 0, 3, or 6% added dietary fat in a 70% concentrate diet. J. Anim. Vet. Advan. 2:44-48.

Frank G. H., R. E. Briggs, G. C. Duff, and H. S. Hurd. 2003. Effect of intranasal exposure to leukotoxin-deficient Mannheimia haemolytica at the time of arrival at the feedyard on the subsequent isolation of Mannheimia haemolytica from nasal secretions of calves. Am. J. Vet. Res. 64:580-585.

Rivera, J. D., ** G. C. Duff, M. L. Galyean, D. M. Hallford, and T. T. Ross. 2003. Effects of graded levels of vitamin E on inflammatory response and evaluation of methods of supplementing vitamin E on performance and health of beef steers. Prof. Anim. Sci. 19:171-177.

** Duff, G. C., K. J. Malcolm-Callis, M. L. Galyean, and D. A. Walker. 2003. Effects of dietary urea concentration on performance and health of receiving cattle and performance and carcass characteristics of finishing cattle. Can. J. Anim. Sci. 83:569-575.

Fulton, R. W., R. E. Briggs, M. E. Payton, A. W. Confer, J. T. Saliki, J. F. Ridpath, L. J. Burge, and G. C. Duff. 2004. Maternally derived humoral immunity to bovine viral diarrhea virus (BVDV)1a, BVDV1b, BVDV2, bovine herpesvirus-1, parainfluenza-3 virus, bovine respiratory syncytial virus, Mannheimia haemolytica and Pasteurella multocida in beef calves, antibody decline by half-life studies and effect on response to vaccination. Vaccine 22:644-650.

Capitan, B. M., C. R. Krehbiel, R. E. Kirksey, L. M. Lauriault, G. C. Duff, and G. B. Donart. 2004. Effect of winter and summer forage type on pasture and feedlot performance and carcass characteristics by beef steer. Prof. Anim. Sci. 20:225-236.

Gleghorn, J. F., N. A. Elam, M. L. Galyean, G. C. Duff, N. A. Cole, and J. D. Rivera. 2004. Effects of crude protein concentration and degradability on performance, carcass characteristics, and serum urea nitrogen concentrations in finishing beef steers. J. Anim. Sci. 82: 2705-2717.

Bailey, C. R., ** G. C. Duff, R. C. Cheatham, S. R. Sanders, T. W. Whitney, O. B. Mendivil, and J. L. Treichel. 2004. Dietary urea concentration and acid-base balance in feedlot steers fed a high concentrate steam-flaked corn-based diet. Can. J. Anim. Sci. 84:741-743.

Fulton, R. W., R. E. Briggs, J. F. Ridpath, J. T. Saliki, A. W. Confer, M. E. Payton, G. C. Duff, D. L. Step and D. L. Walker. 2005. Transmission of Bovine Viral Diarrhea Virus 1b to Susceptible and Vaccinated Calves by Exposure to Persistently Infected Calves. Can. J. Vet. Res. 69:161-169.

Whitney, T. W., ** G. C. Duff, J. K. Collins, D. W. Schafer, and D. M. Hallford. 2006. Effects of diet for early-weaned crossbred beef steers on metabolic profiles and febrile response to an infectious bovine herpes virus-1 challenge. Live. Sci 101:1-9.

Whitney, Travis, ** Glenn Duff, Peder Cuneo, David Henderson, David Schafer, Dennis Hallford, Robert Collier, and Paula Gentry. 2006. Effects of weaning programs on serum metabolites and hepatic IGF-1 mRNA of first calf heifers or mature cows. J Food Agric. Envir. 4(2):49-53.

Ibrahim, R. M., J. A. Marchello, and G. C. Duff. 2006. Effect of zeranol implantation on fatty acid composition of subcutaneous and intramuscular fat in beef steers. Prof. Anim. Sci. 22:301-306.

Cole, N. A., P. F. Defoor, M. L. Galyean, G. C. Duff, and J. Gleghorn. 2006. Effects of phase feeding of crude protein on performance, carcass characteristics, serum urea nitrogen concentrations and manure nitrogen of finishing beef steers. J. Anim. Sci. 84:3421-3432.

Thomas, C. T., A. E. Hoet, S. Sreevatsan, T. E. Wittum, R. Briggs, G. C. Duff, and L J. Saif. 2006. Field transmission of bovine coronavirus and herd immunity against associated respiratory disease in feedlot cattle. Am. J. Vet. Res. 68:1412-1420.

. Duff, G. C., and M. L Galyean. 2007. BOARD SPONSORED REVIEW: Recent advances in management of highly stressed, newly received feedlot cattle. J. Anim. Sci. 85:823-840.

** Duff, G. C. 2007. Integrating lifetime nutrition from cow/calf to stocker to feedlot. L. Hollis and K. C. Olson, eds. Elsevier, Philadelphia, PA. Vet. Clinics of North America: Food Animal Practice 23:177-191.

** Duff, G. C., and C. P. McMurphy. 2007. Feeding Holstein steers from start to finish. L. Hollis and K. C. Olson, eds. Elsevier, Philadelphia, PA. Vet. Clinics of North America: Food Animal Practice 23:281-297.

Bailey, C. R., ** G. C. Duff, S. R. Sanders, J. L. Treichel, L. H. Baumgard, J. A. Marchello, D. W. Schafer, and C. P. McMurphy. 2008. Effects of increasing crude protein concentrations on performance and carcass characteristics of growing and finishing steers and heifers. Anim. Feed Sci. Technol. 142:111-120..

Ibrahim, R. M., J. A. Marchello, G. C. Duff, E. V. Marchello, and D. W. Schafer. 2008. Effect of two breeds and two dietary concentrate levels on feedlot performance, carcass composition and fatty acid profiles. J. Anim. Sci. 86:1426-1433.

Jones, B., R. D. Fish, A. Martin, G. C. Duff, and R. L. Ax. 2008. Effects of supplemental linoleic and linolenic acids on reproduction in Holstein cows. Prof. Anim. Sci 24:500-505.

Cheatham, R. C., **G. C. Duff, C. R. Bailey, S. R. Sanders, R. J. Collier, J. A. Marchello, and L. H. Baumgard. 2008. Effects of implant programs on live performance, carcass characteristics, serum metabolites, fatty acid profiles and lipogenic gene expression of adipose tissue in Holstein steers. S. African J. Anim. Sci. 38:238-246.

Bailey, C. R., ** G. C. Duff, S. R. Sanders, S. P. Cuneo, C. P. McMurphy, S. W. Limesand, J. A. Marchello, D. W. Schafer, M. L. Rhoads, and D. M. Hallford. 2008. Effects of ovariectomy and anabolic steroid implantation on the somatotropic axis in feedlot heifers. S. African J. Anim. Sci. 38:207-216.

Zerai, D. B., K. M. Fitzsimmons, R. J. Collier, and G. C. Duff. 2008. Evaluation of Brewers Waste as partial replacement of fish meal protein in Nile Tilapia (Oreochromis niloticus) diets. J. World Aquaculture Soc. 39:556-564.

Vogel, G. J., G. C. Duff, J. Lehmkuhler, J. L. Beckett, J. S. Drouillard, A. L. Schroeder, W. J. Platter, M. T. Van Koevering, and S. B. Laudert. 2009. Effect of ractopamine hydrochloride on growth performance and carcass traits in calf-fed and yearling Holstein steers fed to slaughter. Prof. Anim. Sci. 25:26-32.

McMurphy, C. P., ** G. C. Duff, M. A. Harris, S. R. Sanders, N. K. Chirase, C. R. Bailey, and R. M. Ibrahim. 2009. Effect of humic/fulvic acid in beef cattle finishing diets on animal performance, ruminal ammonia, and serum urea nitrogen concentration. J. Appl. Anim. Res. 35:97-100.

Beckett, J. L., R. Delmore, G. C. Duff, D. A. Yates, D. M. Allen, and N. Elam. 2009. Effects of zilpaterol hydrochloride on growth rates, feed conversion and carcass traits in calf-fed Holstein steer. J. Anim. Sci. 87:4092-4100.

O'Brien, M. D., R. P. Rhoads, S. R. Sanders, G. C. Duff, and L. H. Baumgard. 2010. Metabolic adaptations to heat stress in growing cattle. Dom. Anim. Endocrin. 38:86-94.

McDaniel, M. D., J. K. Collins, G. C. Duff, S. P. Cuneo, R. D. Glock, and J. W. Campbell. 2010. A survey of southern Arizona calves for persistent infection with bovine viral diarrhea virus. The Bovine Practitioner 44:88-92.

McMurphy, C. P, ** G. C. Duff, S. R. Sanders, C. P. Cuneo, and N. K. Chirase. 2011. Effects of supplementing humates on rumen fermentation of Holstein steers. S African J. Anim. Sci. 41:134-140.

Penrod, L. V., S. E. Deaver, E. K. Prendergast, G. C. Duff, M. L. Rhoads, and M. J. Arns. 2011. Characterization of uterine pH during the estrous cycle of the mare. J. Equine Vet Sci. 31:310-311.

Bernal-Rigoli, J. C., ** G. C. Duff, J. A. Marchello, S. P. Cuneo, S. R. Garcia, G. Xie, L. W. Hall, J. D. Allen, and C. D. Burrows. 2012. Effects of housing and feeding systems on performance of neo-natal Holstein bull calves. J. Anim. Sci. 90:2818-2825.

Allen, J. D., L. W. Hall, J. E. English, and ** G. C. Duff. 2012. Effect of bird depredation on nutrient composition of cattle diets fed at two southwestern cattle facilities. Prof. Anim. Sci. 28:573-577.

Dick, K. J., ** G. C. Duff, S. W. Limesand, S. P. Cuneo, D. K. Knudson, C. P. McMurphy, L. W. Hall, J. C. Bernal-Rigoli, and J. A. Marchello. 2013. Effects of Lactobacillus acidophilus and Propionibacterium freudenreichii on digestive tract morphology of neo-natal/transition Holstein bull calves and performance by calf-fed Holstein steers. Prof. Anim. Sci. 29:107-115.

Sharon, K. P., ** G. C. Duff, J. A. Paterson, J. W. Dailey, J. A. Carroll, and E. A. Marceau. 2013. Case Study: Effects of timing of a modified-live respiratory viral vaccination on performance, feed intake, antibody titer response, and febrile response of beef heifers. Prof. Anim. Sci. 29:307-312.

Xie, G., ** G. C. Duff, L. W. Hall, J. D. Allen, C. D. Burrows, J. C. Bernal-Rigoli, S. E. Dowd, V. Guerriero, C. J. Yeoman. 2013. Alteration of digestive tract microbiome in neo-natal Holstein bull calves by bacitracin methylene disalicylate treatment and scours. J. Anim. Sci. 91:.4984-4990.

Whitehurst, W.A., J. A. Paterson, M. M. Harbac, M. K. Petersen, G. C. Duff, T. W. Geary, G. I. Zanton, and T. J. Whistuba. 2014. Comparison of methionine hydroxyl analog chelated versus sulfate forms of copper, zinc and manganese on growth performance and pregnancy rates in yearling beef replacement heifers. Prof. Anim. Sci. 30:62-67.

Sharon, Kate, ** Glenn Duff, Jeff Dailey, Jeff Carroll, Jonathan Hilmer, and Brian Bothner. 2014. Effects of supplemental lysine on performance, antibody titer, and rectal temperature in response to a modified-live viral vaccine in neonatal calves. Am. J. Anim. Vet. Sci. 9:122-127.

Ham, BR. C. Myrick , F. T. Barrows , C. J. Yeoman , G. C. Duff , M. G. Maskill, and W. M. Sealey. 2015. Feed characteristics alter growth efficiency of cutthroat trout. J. Fish and Wildlife Manage. 6:83-91.

Vogstad, A. R., B. Stokes, K. Perz, T. Wurtz, M. Hoyt, K. Spence, and ** G. C. Duff. 2015. Effects of imposed intake variation at high and low levels of milk replacer on neonatal Holstein calf performance and health. Prof. Anim. Sci. 31:159-166.

Ham, B. R., F. T. Barrows, A. Huttinger, G. C. Duff, C. J. Yeoman, M. G. Maskill, and W. M. Sealey. 2015. The evaluation of dietary soy sensitivity in snake river cutthroat trout (Oncorhynchus clarkia). N. Am. J. Aquaculture 77:195-205.

Gedir J.V., J. W. Cain III, P. R. Krausman, J. D. Allen, G. C. Duff, and J. R. Margaret. 2016. Potential foraging decisions by a desert ungulate to balance water and nutrient intake in a water-stressed environment. PLoS ONE 11(2):e0148795.doi:10.1371/journal.pone.0148795

Cain, III, J. W., J. V. Gedir, J. P. Marshal, P. R. Krausman, J. D. Allen, G. C. Duff, B. D. Jansen and J. Morgart.. 2017. Extreme precipitation variability, forage quality and large herbivore diet selection in arid environments. Oikos (In Press).

Betiku, O. C., C. J. Yeoman, T. G. Gaylord, S. L. Ishaq, G. C. Duff, A. Mazurie, and W. M. Sealey. 2017. Divided nutritive function of the rainbow trout (Oncorhynchus mykiss) mid-and hind-gut microbiomes. Microbiome J. (Submitted).

Betiku, O. C, C. J. Yeoman, T. G. Gaylord, Z. Cooley, T. Hamerly, S. Sawicki, S. Olivo, G. C. Duff, B. Bothner, S. S. Block5, F. T. Barrows6, and W. M. Sealey. 2017. Differences in amino acid catabolism by gut microbes resulting from dietary inclusion of GDDY affect feed utilization in Rainbow Trout. (In preparation).

Scholarly Presentations (2001 to present)
** Denotes presenter

Seminars/Workshops

** Duff, G. C. 2002 Role of Trace Minerals in Cow-Calf Health. Cow-Calf Health Programs for Arizona. Cliff Castle Casino, Camp Verde, AZ. Invited.

** Duff, G. C. 2004. Protein Requirements for Finishing Beef Cattle. Range Livestock Nutrition for the Southwest: What We've Learned and how to apply it. December 1, 2004 (Tucson, AZ), December 2, 2004 (Camp Verde, AZ), and December 3, 2004 (St. Johns, AZ). Invited

** Duff, G. C. 2004. Lamb Nutrition. Future of Lamb Production in Arizona. Presented material on lamb nutrition for seminar held at the University of Arizona Meats Lab on September 29 and 30, 2004. Invited

** Duff, G. C. 2004. Ruminant nutrition presentation for the University of Arizona Cooperative Extension Service Youth Quality Assurance Workshop. March 2004. Invited

** Duff, G. C. 2007. Heifer Development for San Carlos Apache Reservation. Invited.

** Duff, G. C. 2007. Ruminant Nutrition for the Grass fed Meat Production Workshop on Animal Health and Nutrition. Fall 2007. Invited

** Duff, G. C. 2008. Ruminant nutrition presentation for the University of Arizona Cooperative Extension Service Youth Quality Assurance Workshop. January 2008. Invited

Conferences and Symposia

** Duff, G. C., M. H. Ralphs, D. A. Walker, J. D. Graham, J. D. Rivera, and L. F. James. 2001. Influence of beef breeds (Brangus, Charolais, or Hereford) on locoweed consumption. Western Section American Society of Animal Sciences. Submitted presentation.

** Duff, G. C., B. D. Hunsaker, A. C. Anderson, J. D. Roder, and D. A. Walker. 2002. Florfenicol concentration in serum of beef cattle fed 0, 3, or 6% added dietary fat in a 70% concentrate diet. Midwestern Section American Society of Animal Science Submitted presentation.

** Duff, G. C., M. L. Galyean, and N. A. Cole. 2002. Dietary protein for beef cattle finishing diets. Southwest Nutrition and Management Conference. Invited.

** Duff, G. C., M. L. Galyean, C. R. Krehbiel, and N. A. Cole. 2002. Overview of recent protein research for beef cattle. Plains Nutritional Council Spring Conference. Invited

** Duff, G. C. 2004 University Update. Plains Nutrition Council Invited.

** Duff, G. C. 2004. Nutrition health interactions during the mid- and late-term feeding period. 2004 American Veterinary Academy Summer Conference. Ft. Collins, CO Invited.

Cheatham, R. C., and ** G. C. Duff. 2004. Implant programs for long-fed Holstein steers. 19th Annual Southwest Nutrition and Management Conference. Invited

Bailey, C. R., and ** G. C. Duff. 2005. Protein requirements for finishing beef cattle. 20th Annual Southwest Nutrition and Management Conference. Invited

** Allen, R. A., and ** G. C. Duff. 2006. Update on Holstein blemish research at the University of Arizona. Arizona/California Cattle Feeders' Conference.

** Duff, G. C. and P. T. Andersen. 2007. Comparative Performance of Holstein vs. beef breeds in the feedlot. 22nd Annual Southwest Nutrition and Management Conference. Invited

** Duff, G. C. 2007. Impact of preweaning nutrition programs on calf growth and development. Western Section American Society of Animal Science Beef Symposium. "The Repercussions of lifetime nutrition programs." Invited

** Duff, G. C. 2007. Raising Holstein steers in the desert southwest: Implications of nutrition and environment. Arizona Dairy Production Conference. Invited

** Duff, G. C. 2014. Effects of nutrition on carcass characteristics of beef cattle. Besi Sigirciligi Sempozyumu. May 8 to May 11, 2014. Papillon Zeugma Otel, Antalya Turkey. Invited

** Duff, G. C. and C. J. Yeoman. 2015. Morphological, microbiological, and biochemical development of the ruminant gastrointestinal tract. July 2015. American Society of Animal Sciences Joint Animal Meeting. Orlando, FL. Invited

TEACHING AND ADVISING

Extent of Teaching Courses

University of Arizona
Course Title Term Enrollment
AnS 234 Feeds and Feeding Spring 2002 12
AnS 336 Applied Animal Nutrition Spring 2002 18
AnS 596Seminar Spring 2002 13
AnS 336 Applied Animal Nutrition Spring 2003 32
AnS 565 Advanced Nutrition Feedlot Spring 2003 6
AnS 336 Applied Animal Nutrition Spring 2004 33
AnS 596Seminar Spring 2004 15
AnS 336 Applied Animal Nutrition Spring 2005 28
AnS 465 Advanced Nutrition Feedlot Spring 2005 12
AnS 498 Senior Capstone Spring 2005 21
AnS 336 Applied Animal Nutrition Spring 2006 30
AnS 336 Applied Animal Nutrition Spring 2007 38
AnS 465 Advanced Nutrition Feedlot Spring 2007 8
AnS 553 Statistics for Applied Exp. Fall 2007 14
AnS 336 Applied Animal Nutrition Spring 2008 47
AnS 336 Applied Animal Nutrition Spring 2009 50
AnS 553 Statistics for Applied Exp. Fall 2009 16
AnS 338 Prin. of Comp. Animal Nut. Summer 2010 8

Montana State University
ARNR 434 Beef Management Fall 2010 42
ARNR 507Research Methods Spring 2011 8
ANSC 434 Beef Management Fall 2011 40
ANSC 100 Introductory Anim Sci Spring 2012 198
ANSC 434 Beef Management Fall 2012 26
VM 580 Basic Nutrition Spring 2015 11

New Mexico State University
ANSC 427 Dairy Production Spring 2016 11
ANSC 247 Introduction to Meat Sci Fall 201654

Co-taught Courses
AnS 334 Principles of Nutrition Co-taught with Drs. Schurg and Baumgard. 40 to 50 students/year. Fall 2003, 2004, and 2005 University of Arizona

Guest Lectures
University of Arizona
AnS 102 Animal Industry. Two lectures and one laboratory/year covering animal nutrition. Fall 2002 - Present
AnS 477 Beef Resource Management. One to three lectures/year on feedlot nutrition and health. 2002-Present
V Sc 195F Careers in Veterinary Sci. One lecture/year covering beef cattle Fall 2002-2006
V Sc 543 Research Animal Methods One lecture on beef cattle research. 2005
V Sc 505 Diseases of Livestock. One to two lectures/year covering feedlot nutrition and health 2006, 2007, and 2008
AGSC 101 Intro to Ag and Environmental Resources. One lecture/year on Animal and Range Science Program 2011 and 2012.
ANSC 222 Livestock in Sustainable Systems. Lectures on Beef and Dairy Industry 2012.

Courses Developed
AnS 336 Principles of Animal Nutrition Co-developed with Drs. Schurg and Baumgard
An S 465/565 Advanced Nutrition/Feedlot
An S 553 Statistical for Applied Biological Experiments
AnS 338 Principles of Companion Animal Nutrition
VM 580 Basic Nutrition
ANSC 427 Dairy Production
ANSC 247 Introduction to Meat Science

Faculty Advisor of Clubs

University of Arizona
Collegiate Cattle Growers Association. This club is active in a variety of projects including a getting cattle ready for show competition at the Arizona National Livestock Show. In addition, the students run a Jackpot Show (a competition for area 4-H and FFA members to show their livestock and get ready for county and/or state fairs). The club has held clinics to teach 4H and FFA members on proper techniques for selection of animals and proper methods to get the animal ready for livestock shows. Fund raising events include a booth at the University of Arizona Spring Fling. In addition, cub members have started raising cattle and swine to support their activities. A discussion of future endeavors for the club with Drs. Marchello and Allen include the students marketing their products through the U of A Meats Laboratory.

Montana State University, Bozeman
AgStuCo. Agriculture Student Council Advisor 2010-1012 Co-Advisor 2014. This club is made up with representatives for all College of Agriculture clubs. The Agriculture Student Council strives to promote agriculture within the College, the university, and the state. The Council fulfills this mission by promoting the programs, organizations, and objectives of the College of Agriculture. The Council provides a sounding board for students and allows input into the actions of the College administration. The goal is to

Undergraduate Honors Thesis
Ms. Kristi Rhodes, Department of Veterinary Science and Microbiology, The University of Arizona.

Thesis directed
Jeff Mikus. New Mexico State University

Ms. Rita Camille Cheatham, The University of Arizona

Ms. Karianne Dick, The University of Arizona

Mr. Casey McMurphy, The University of Arizona

Research Chair for Mr. James English. (M.S. degree in Agriculture Education)

Mr. Laun Hall, The University of Arizona

Ms. Christina Bernal Rigoli The University of Arizona

Mr. Chirs Burrows, The University of Arizona

Mr. Guahao Xie, The University of Arizona

Ms. Kate Sharon, Montana State University

Ms. Kaitlyn Spence, Montana State University

Mr. Brian Ham, Montana State University

Service on Thesis Committee
Served on four M.S. committees as Assistant Professor for New Mexico State University.

Service at the University of Arizona includes:
Kendra Suhling, Major Professor - Dr. Mark Arns

Desale Zerai, Major Professor - Dr. Kevin Fitzsimmons and Dr. Robert Collier

Octavio Mendevil, Major Professor Dr. Lance Baumgard

Gina Mazella, Major Professor - Dr. Mark Arns

Alison Fitzgerald Major Professor Dr. Lance Baumgard and Dr. Robert Collier

Hank Haflinger III Major Professor Dr. Lance Baumgard

Matt McDaniel, (V Sc) Major Professor Dr. Bob Glock

Bonnie Jones, Major Professor Dr. Roy Ax.

Gilad Schwartz, Major Professor Dr. Lance Baumgard

Justice Mumba, Major Professor Dr. Robert Collier

Morgan OBrien Major Professor Dr. Lance Baumgard

Dissertation in Progress
Ms. Omolola Betiku, started working on Ph.D. program in 2012. Completed comprehensive exam during October 2013 with estimated completion 2017

Dissertations Directed

Dr. Daniel Rivera, New Mexico State University, Dr. Rivera is Associate Professor Mississippi State University.

Dr. Travis Whitney. The University of Arizona, Travis is an Associate Professor for Texas A&M University in San Angelo, TX.

Dr. Clayton Bailey. The University of Arizona. Clay is a nutritionist for Tyson, Springdale, AR.

Dr. Jamie Allen, The University of Arizona. Dr. Allen is an Quality Assurance director for a private feed company in Utah

Dr. Bob Sager, DVM. Defended December 2014. Currently on staff for a livestock company in Russia

Dissertation Committees

Served as Co-Chair on one Ph.D. committee (Dr. Daniel Rivera) and as a member on two PhD. Committees (Dr. Sergio Soto-Navarro and Dr. Michael Brown) at New Mexico State University.

Dr. Chel Moore, Major Professor - Dr. Lance Baumgard

Dr. Jane Kay, Major Professor - Dr. Lance Baumgard

Dr. Rita Ibrahim, Major Professor Dr. John Marchello

Dr. Rose Marie Burgos, Major Professor Dr. Robert Collier

Development and Scholarly Activity Supporting Teaching
Western Teaching Symposium in Davis, CA. 2002

College of Agriculture and Life Sciences seminars
"Playing by the Rules" Promoting Honesty & Integrity: Discouraging Plagiarism. Facilitated by Kathleen F. Gabriel 2004
"Teaching backwards" Facilitated by Dr. Jack Elliott. 2006

Western Teaching Symposium in Tucson, AZ. 2008

Evaluation of Teaching and Teaching Portfolio
Student Evaluations of Teaching

Statistics of the Overall Teaching Effectiveness Question

Course* Title Term Section Mean Comp Group++
AnS 234Feeds and Feeding Spr 20023.3NA
AnS 336Applied Animal Nutrition Spr 20025.0 NA
AnS 596SeminarSpr 2002NANA
AnS 336Lec Applied Animal Nutrition Spr 20034.24.6
AnS 336Lab4.24.4
AnS 565Advanced Nutrition Feedlot Spr 20034.74.3
AnS 336Lec Applied Animal Nutrition Spr 20044.74.4
AnS 596SeminarSpr 2004NANA
AnS 336Applied Animal Nutrition Spr 20054.64.4
AnS 465Advanced Nutrition Feedlot Spr 20054.74.4
AnS 498Senior Capstone Spr 20054.7NA
AnS 336Lec Applied Animal Nutrition Spr 2006 4.74.4
AnS 336Lab4.74.6
AnS 336Lec Applied Animal Nutrition Spr 20074.64.4
AnS 336Lab 4.3 4.6
AnS 465Advanced Nutrition Feedlot Spr 20074.64.4
AnS 553Statistics for Applied Exp.Fall 20074.24.3
AnS 336Applied Animal Nutrition Spr 20084.64.4

*For AnS 336, lecture was separated from laboratory for 2003, 2006, and 2007; other years TCE reports were combined.
++ The comparison group consists of courses taught during the past six years (Fall and Spring semester only) enrolling five or more student at the same subject area (determined by course subject prefix).