Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 23, 386-393, Copyright © 1980 by Society for the Study of Reproduction

Plasma Concentrations of Six Steroids and LH During the Ovulatory Cycle of the Hen, Gallus domesticus

A. L. JOHNSON 1, and A. van TIENHOVEN 1

1 Department of Poultry Science, Cornell University, Ithaca, New York 14853


Five laying hens were serially sampled via a brachial vein cannula at 2 h intervals for a period of 34 to 72 h. Plasma samples were grouped to the nearest 2 h interval relative to the estimated time of ovulation, and subsequently each sample was assayed for progesterone (P4), estradiol-17beta (E2), estrone (E1), testosterone (T), 5agr-dihydrotestosterone (DHT), corticosterone (B), and LH. Mean concentrations of plasma LH, P4, E1, E2, and DHT were highest 6 h prior to ovulation, while a peak of T preceded ovulation by 8 h. There was a surge of B preceding ovulation by 2 h; however, this is attributed to a peak related to oviposition and not to ovulation. There was a small daily surge of LH occurring at the onset of darkness regardless of whether an ovulation occurred on the subsequent morning. These hormone fluctuations are discussed with reference to the potential direct or indirect role of each hormone in the induction of ovulation.

Note:
ACKNOWLEDGMENTS We wish to thank Ms. S. M. Quirk for excellent technical assistance, Dr. F. J. Cunningham for the LH assay materials, Dr. R. Butler for supplying us with second antibody, Dr. R. J. Etches for the B antiserum, Dr. D. Solomon for advice concerning statistical analysis, Ms. V. Eisner for preparation of figures, and Ms. P. A. Johnson for reviewing the manuscript.

Submitted on April 28, 1980
Accepted on June 23, 1980




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Copyright © 1980 by the Society for the Study of Reproduction.