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Biology of Reproduction, Vol 14, 109-114, Copyright © 1976 by Society for the Study of Reproduction

Peripheral Estrogen Levels During the Laying Cycle of the Hen (Gallus domesticus)

JEAN W. GRABER 1, and A. V. NALBANDOV 1

1 Illinois State Natural History Survey, Urbana, Illinois 61801 and Animal Science Department, Animal Genetics, University of Illinois, Urbana, Illinois 61801


Total estrogen concentration in hen plasma varied from less than 25 pg/ml to over 600 pg/ml. In laying hens there were 4 peaks of which the first occurred about 1 h before ovulation and the other peaks followed at about 6-hour intervals thereafter. Layers had low estrogen levels at the time ovulation was expected but did not occur. A broody hen (mid-incubation) had very low levels at all times in the day. Nonlaying hens and layers on days of no ovulation had 2 daily peaks. Estrogen levels were higher in long ovarian cycles (time from ovulation to oviposition) than in short cycles. This may be due to a time shift in phase of the estrogen peaks as the sequence (clutch) of eggs is laid or to a gradual failure of the hypothalamo-pituitary system in the production of gonadotrophin.

Note:
ACKNOWLEDGMENT This research was supported by USPHS grant HD 03043.

Submitted on May 28, 1975
Accepted on August 29, 1975






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Copyright © 1976 by the Society for the Study of Reproduction.