J. Anim Sci.
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J. Anim Sci. 1972. 34:479-482.
© 1972 American Society of Animal Science
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Effect of Level of Protein and Energy during Flushing on Lambing Performance of Range Ewes1

D. T. Torell, I. D. Hume and W. C. Weir

University of California,2 Davis 95616

Abstract

Two experiments were conducted to study the effect on subsequent lambing performance of varying levels of protein and energy in the diet of range ewes immediately prior to and during breeding. In the first experiment lambing percentage (lambs born x 100/ewe present at lambing) increased from 102% for ewes receiving 33 g N and 2.0 Mcal DE/day to 166% for those receiving 53 g N and 4.4 Mcal DE/day (P<.001). In the second experiment lambing percentage increased from 107% for ewes receiving 10 g N and 1.9 Mcal DE/day to 139% for those receiving 46 g N and 46 Mcal DE/day (P<.OS). Multiple regression analysis was used to examine the effect of level of protein and level of energy in the diet during flushing on lambing performance. In the first experiment 7% of the regression sum of squares was due to protein, 61% to energy, and 32% to the joint effect of protein and energy. In the second experiment the contributions to the sum of squares due to regression were 21% (protein), 35% (energy) and 44% (joint effect of protein and energy). In both experiments the relative importance of protein alone and energy alone was inversely related to the amount of each supplied by the basal ration.

Footnotes

1 Appreciation is expressed to Mr. R. A. Rainoldi, Hopland Field Station, for technical help in the conduct of both experiments, and to Dr. C. Crempien, School of Veterinary Medicine, University of Chile, for supervision of the second experiment while the senior author was on leave of absence to the University of Chile.

2 Department of Animal Science.






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