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Protein Utilization in Ruminants

I. Blood Urea Nitrogen as Affected by Protein Intake^{1, 2,}

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

Three experiments were conducted with growing-finishing lambs to determine whether blood urea nitrogen was associated with protein intake. A close relationship was found (r = 0.986) indicating that this blood nitrogen constituent could be quantitated with protein intake. An equation for the determination of digestible protein required by lambs is also presented. Approximately 21 g of digestible protein were required for each 1000 kcal of digestible energy consumed.

² This study was supported in part by a grant from the National Feed Ingredients Association and is part of Regional Project NC-63.

Manuscript received 14 November 1964.

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