Journal of Nutrition

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Journal of Nutrition Vol. 39 No. 2 October 1949, pp. 167-176
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The Essential Amino Acid (Except Tryptophan) Content of Colostrum and Milk of the Cow and Ewe1

K. A. Kuken and P. B. Pearson

Department of Biochemistry and Nutrition, Texas Agricultural Experiment Station of Texas Agricultural and Mechanical System, College Station

Colostrum and milk of the cow and ewe were assayed for arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine and valine by microbiological methods. The milk protein from both species contained about 1.4 times as much methionine as the protein of colostrum, but only 0.6 times as much threonine. Much smaller differences were noted in the relative proportions of the other amino acids. The amino acid patterns of the milk and colostrum of the two species are very similar.

1 Acknowledgments are made to Mary Trant, Shirley Dieterich, Lila Corley and Patricia Sparks for technical assistance with the work.

Manuscript received 17 June 1949.




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