The most appropriate sheep breed depends upon environmental conditions, the producer's desired management intensity, and personal preference. For accelerated sheep production, it might be necessary to use three or more breeds to develop a ewe flock that exhibits acceptable levels of desirable traits. Accelerated flocks must be able to lamb out of season, produce large lamb crops, reach sexual maturity at an early age, and grow rapidly.
If producers want to overwinter ewes for spring lamb production, then local breeds such as range-raised, fine-wool ewes are an excellent choice. Breeds of sheep are generally classified according to the breed assets.