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Journal of Dairy Science Vol. 32 No. 5 458-464
© 1949 by American Dairy Science Association ®
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Properties of the Colostrum of the Dairy Cow. IV. Effect of Form of Vitamin A and of Tocopherol Supplements on Concentrations of Vitamin A and Carotenoids1

D. B. Parrish, G. H. Wise2 and J. S. Hughes

Kansas Agricultural Experiment Station, Manhattan, Kansas

ABSTRACT

The rations of dairy cows and heifers were supplemented with either various amounts of tocopherols or with large quantities of vitamin A ester, vitamin A alcohol or vitamin A alcohol plus tocopherols during the terminal 4 weeks (average minimum) of gestation. The relative effects of these prepartal supplements on vitamin A and carotenoid concentrations of colostrum and early milk were investigated.

In view of the individual variation observed within the same groups, differences found in vitamin A concentrations in colostrum and early milk could not be ascribed to the form or combination of vitamin supplements given. Thus, vitamin A ester, vitamin A alcohol and vitamin A alcohol plus tocopherols appeared to be of a similar value in affecting increases in vitamin A levels of colostrum and early milk.

In a trial with a limited number of cows, addition of tocopherols at various levels to barn rations did not increase substantially vitamin A content of colostrum and early milk.

Neither the form of vitamin A supplement given nor the addition of tocopherols had a significant effect on carotenoid levels of the early mammary secretions.

FOOTNOTES

1 Contribution no. 380, Department of Chemistry and no. 182, Department of Dairy Husbandry.

2 Present Address, Department of Animal Industry, North Carolina State College, Raleigh, N. C.






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Copyright © 1949 by the American Dairy Science Association ®.