J. Anim Sci.
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J. Anim Sci. 1983. 57:1512-1516.
© 1983 American Society of Animal Science
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Effect of Charcoal-Treated Bovine Follicular Fluid on Secretion of LH and FSH in Ovariectomized Heifers1

J. J. Ireland2, A. D. Curato3 and J. Wilson

Michigan State University4, East Lansing 48824-1225

2 To whom reprint request should be made.

Abstract

The objective of the experiment was to determine whether pools of charcoal-treated bovine follicular fluid (bFF) removed from large (>10 mm) follicles during the preovulatory (d 18 to 1), postovulatory (d 2 to 6) or mid-cycle (d 7 to 17) stages of the bovine estrous cycle altered secretion of luteinizing hormone (LH) or follicle-stimulating hormone (FSH) in ovariectomized heifers. After a 20-ml injection of bFF given at three consecutive 6-h intervals, secretion of FSH was depressed from approximately 116 to 53 ng/ml by each pool of bFF. In contrast, bFF did not affect secretion of LH. Serum from an ovariectomized cow (control) had no effect on secretion of LH or FSH. We concluded that bFF contained a nonsteroidal component (perhaps inhibin) that suppressed FSH secretion in heifers.

Footnotes

1 We gratefully acknowledge: members of the large Animal Reproduction Laboratory for round-the-clock help in bleeding cows; Dr. Gavin Cheng, Univ. of Manitoba, Canada, for donation of bFSH, and Drs. Clyde Anderson and John Gill for assistance in computer analyses. An abstract of some of these data was presented at the 1982 joint Annu. Meet. of the Amer. Soc. of Anim. Sci. and Can. Soc. of Anim. Sci. This article was published with permission of the Director of the Michigan State Agr. Exp. Sta. as journal article 10698

3 Present address: Dept. of Zool., Univ. of Wisconsin, Madison.

4 Dept. of Anim. Sci.






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Copyright © 1983 by the American Society of Animal Science.