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Journal of Dairy Science Vol. 41 No. 1 143-151
© 1958 by American Dairy Science Association ®
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Rate of Absorption of Carotene and of Vitamin A from the Alimentary Tract of Dairy Calves.1II. Effects of Methods of Dispersion and of Administration

G. W. Wise2, N. L. Jacobson, R. S. Allen and S. P. Yang3

Iowa State College, Ames

ABSTRACT

Different dispersions and methods of administration of vitamin A-active supplements on their apparent absorption by calves were studied. Vitamin A in an oily menstruum, an homogenized emulsion, and an aqueous dispersion—and carotenoids—in an oily solution and an emulsion—were mixed in a filled milk and fed via nipple. Vitamin A supplements, as an oily medium and as an aqueous dispersion, also in milk, were administered by a stomach tube. The rate of administration was 1,000 I.U/lb body weight. Changes in concentrations of vitamin A and of carotenoids in blood plasma, collected at 3-hr. intervals during a 15-hr. period after feeding the supplements, were the criteria of absorption. Concentrations of vitamin A in blood plasma increased and subsequently decreased more rapidly than did those of carotenoids. Emulsifying oily supplements in milk by homogenization significantly enhanced the apparent absorption of carotenoids but did not improve markedly the absorption of vitamin A. Aqueous dispersion of vitamin A effected more rapid passage into the blood and a higher maximum level than did either the emulsion or the oily solution. Ingestion of vitamin A by nipple resulted in more rapid absorption and higher concentrations in the plasma than did administration by stomach tube.

FOOTNOTES

1 Journal Paper No. J-3226 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project No. 814.

2 Present address: Animal Nutrition Section, Department of Animal Industry, N. C. State College, Raleigh.

3 Present address: Purdue Univ., Lafayette, Ind.






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Copyright © 1958 by the American Dairy Science Association ®.