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Amino Acid Nutrition of the Young Calf. Estimation of Methionine and Lysine Requirements^{1 ,2,}

Department of Dairy Science, University of Illinois, Urbana 61801

ABSTRACT

A semipurified diet containing 14 crystalline amino acids as the sole source of nitrogen was used qualitatively and quantitatively to determine dietary needs of the young calf for lysine and methionine.

Body weight gain, nitrogen balance, and concentrations of free amino acids in plasma were the criteria to assess the response of young calves to the experimental diets containing graded amounts of lysine and methionine. By these methods the methionine requirement as D-L methionine in the absence of cystine ranged from .17 to .23 g/day/kg body weight (.65 g/kg weight^.75).

¹ Part of thesis of senior author submitted to graduate college in partial fulfillment of the requirement for Ph.D. in nutritional sciences at University of Illinois, Urbana-Champaign, 1974.

² This research was supported in part by Illinois Agricultural Experiment Station Project 35-335 and USPHS Predoctoral Training Grant GM00653.