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Journal of Dairy Science Vol. 72 No. 7 1854-1858
© 1989 by American Dairy Science Association ®
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Relationship of Plasma ß-Carotene and Vitamin A to Luteal Function in Postpartum Cattle1

R. L. Graves-Hoagland2, T. A. Hoagland3 and C. O. Woody

Department of Animal Science, University of Connecticut, Storrs 06268

3 Author to whom correspondence should be addressed.

ABSTRACT

The influence of plasma concentrations of ß-carotene and vitamin A on in vivo progesterone production by bovine corpora lutea after gonadotropin-releasing hormone-induced LH release was assessed in 39 postpartum dairy cows. Thirty Holsteins and nine Jerseys were given 100 µg gonadotropin-releasing hormone on d 12 of an estrous cycle, which began from 30 to 49 d postpartum. Concentrations of ß-carotene and vitamin A in plasma and progesterone and LH in serum were determined prior to gonadotropin-releasing hormone injection (0 h); serum progesterone and LH concentrations were also determined 1, 2, and 3 h after injection of gonadotropin-releasing hormone. Serum concentrations of progesterone and LH were increased by gonadotropin-releasing hormone. Incremental progesterone production in an analysis of covariance was influenced by breed as well as the interactions of breed with vitamin A, of season with ß-carotene, and of season with vitamin A. The regression coefficients were positive for ß-carotene and negative for vitamin A in all cases. In conclusion, luteal function in the postpartum cow appears to be related to plasma concentrations of ß-carotene and vitamin A.

FOOTNOTES

1 Scientific Contribution Number 1244, Storrs Agricultural Experiment Station, University of Connecticut, Storrs.

2 Present address: The American Red Cross, 209 Farmington Avenue, Farmington, CT 06032.






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Copyright © 1989 by the American Dairy Science Association ®.