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Journal of Nutrition Vol. 90 No. 2 October 1966, pp. 157-160
Copyright © 1966 by American Society for Nutrition
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Protein Requirements of Growing-Finishing Cattle and Lambs1

R. L. Preston

Department of Animal Husbandry, College of Agriculture, University of Missouri, Columbia, Missouri

Data were summarized which indicate that the protein requirements of growing-finishing cattle and lambs are a function of body weight, body weight gain and digestibility of the protein in the ration. Daily digestible protein requirements can be expressed by the following equations: cattle, DP = 2.79 Wkg0.75 (1 + 1.905 G) lambs, DP = 2.79 Wkg0.75 (1 + 6.02 G) where DP is the amount of digestible protein (g), Wkg0.75 is the metabolic mass and G is the daily gain (kg). Ideally, the above equations need to be modified such that body weight and weight gain can be replaced with carcass weight and gain of a specified composition.

1 Contribution from the Missouri Agricultural Experiment Station, Journal Series no. 2794. Approved by the Director.

Manuscript received 14 March 1966.




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