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Wool and Lamb Production as Affected by the Source of Protein in the Ration of the Mature Ewe¹

Experimental Station

Abstract

PREVIOUS experiments conducted at this Station (Slen and Whiting, 1952, 1952a, 1952b) have established the approximate protein requirements of mature range ewes for maximum wool and lamb production. In these experiments linseed meal was the only protein studied. Since there is considerable disagreement as to whether all proteins are of equal value for the ruminant animal it was considered of importance to compare a number of protein sources in the rations for ewes for wool and lamb production.

Johnson et al. (1944) and Hamilton et al. (1948) used the pairedfeeding technique in N-balance studies to evaluate protein sources for growing lambs. They concluded that, up to a level of 11 to 12 percent protein equivalent in the ration, practically all of the nitrogen consumed was used by the microorganisms of the paunch for the synthesis of their own cellular proteins and that preformed food proteins showed no appreciable differences in biological values.

¹ Contribution from the Division of Animal Husbandry, Experimental Farms Service, Canada Department of Agriculture, Ottawa.

² Wool Specialist and Animal Nutritionist, respectively. Lethbridge, Alberta.

³ The authors wish to acknowledge the assistance of R. D. Clark, Animal Husbandman, for supervising the sheep while on feed and that of L. M. Bezeau for the chemical analyses and digestion studies.