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Growth in Corriedale and Rambouillet Sheep Under Range Conditions

United States Department of Agriculture

Abstract

Growth is one of the most important factors with which the livestock producer deals. While this highly intricate and interesting phenomenon is universal, attempts to study it intensively in livestock have been quite limited. Some data on the growth of sheep in body weight have been reported by Foster (1926), Phillips (1928), Hammond (1932), Bell, Spencer, and Hardy (1936), and Phillips and Brier (1940). Most of these data were obtained on the mutton breeds of sheep, and all were obtained on animals raised under farm flock conditions.

No growth data on sheep reared under western range conditions appear to be available in the literature. During two seasons such data have been collected on lambs at the Western Sheep Breeding Laboratory, Dubois, Idaho. The object of this paper is to present the growth data obtained, so they may be available, for the use of other workers in the field.

¹ Formerly Physiologist, now Head, Animal Husbandry Department, Utah State Agricultural College.

² Formerly Junior Statistician, now with the Meteorological Institute, University of Chicago.