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Journal of Dairy Science Vol. 59 No. 4 607-613
© 1976 by American Dairy Science Association ®
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Mammary Transfer of Vitamin A Alcohol and Ester in Lactating Dairy Cows1

J. E. Tomlinson2, R. W. Hemken, G. E. Mitchell, Jr. and R. E. Tucker

Department of Animal Sciences, University of Kentucky, Lexington 40506

ABSTRACT

The effect of intravenous injection of vitamin A alcohol and vitamin A ester on the vitamin A concentration of bovine milk was studied. Holstein cows received either an intravenous injection of 1 million international units (IU) of vitamin A alcohol, 1 million international units of vitamin A palmitate, or served as controls. Blood serum and milk were sampled at intervals prior to and following injection. Mean concentrations of vitamin A in milk at time 0 were 59.0, 52.0, and 58.4 µg/100 ml for the control, alcohol, and palmitate treatments. Mean concentrations of vitamin A in milk, expressed as µg/100 ml or µg/g fat of cows receiving vitamin A alcohol at +195, +451, and +678 min postinjection, were greater than concentrations for either control cows or cows receiving palmitate. Partition of milk Vitamin A at +195 min postinjection for cows injected with vitamin A alcohol showed 4.1% of the recovered vitamin A in the alcohol and 95.9% in the ester form. Injection of vitamin A palmitate had little effect on milk vitamin A concentration. Vitamin A in serum µg/100 ml) at 195 min after vitamin A alcohol injection was higher (100.4) than for either control (84.0) or cows injected with vitamin A palmitate (89.0).

FOOTNOTES

1 This manuscript (75-5-146) is published with the approval of the Director of the Kentucky Agricultural Experiment Station.

2 Dairy Research Department, Ralston Purina Co., Checkerboard Square, St. Louis, MO 63188.






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Copyright © 1976 by the American Dairy Science Association ®.