Journal of Nutrition Animal Diets/Enrichment Products...

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Journal of Nutrition Vol. 33 No. 5 May 1947, pp. 553-559
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Amino Acid Content of Feeds

I. Leucine, Valine, Isoleucine and Phenylalanine1

B. S. Schweigert

Nutrition Laboratory, Agricultural Experiment Station, and the School of Agriculture, Agricultural and Mechanical College of Texas, College Station

1. The leucine, valine, isoleucine and phenylalanine contents of various feed materials have been determined by the use of microbiological methods.
2. Values for these amino acids in different lots of corn, corn gluten meal, alfalfa leaf meal, milo and soybean oil meal were quite uniform. More variability was observed between different samples of meat and bone scraps.
3. The differences between the amino acid content of 2 rations calculated from data on individual ingredients and determined by actual analysis were within ± 7%.

1 Acknowledgments are made to Frances Panzer and Patricia Sparks for technical assistance, to Mr. H. L. German and Dr. L. R. Richardson for supplying some of the feed samples, to Dr. C. M. Lyman and Dr. K. A. Kuiken for the analytically pure amino acid standards, to Lederle Laboratories for supplying the L. casei factor, to Merck and Co. for pyridoxamine and some of the amino acids and also to the Dow Chemical Co. for some of the amino acids used in this investigation.

Manuscript received 24 December 1946.




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