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Journal of Dairy Science Vol. 31 No. 3 183-187
© 1948 by American Dairy Science Association ®
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The Nutrition of the Newborn Dairy Calf. I. Changes in the Tryptophan Content of the Blood Plasma Following Birth and the Ingestion of Colostrum

T. S. Sutton and G. C. Esh1

Department of Dairy Husbandry and the Institute of Nutrition and Food Technology, The Ohio State University and The Ohio Agricultural Experiment Station

ABSTRACT

A study of the tryptophan content of the blood plasma of calves showed average values of 0.46, 0.94, 0.96, 0.86, and 0.81 mg. per g. wet basis for the newborn calf and at 3, 7, 14 and 21 days of age, respectively.

The amount of tryptophan in first-milking colostrum was found to be about five times as high and that of the second milking about three times as high as that of normal milk.

These results are discussed in the light of tryptophan being the possible precursor for the in vivo synthesis of nicotinic acid.

FOOTNOTES

1 A graduate student at The Ohio State University supported by the Government of India.






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Copyright © 1948 by the American Dairy Science Association ®.