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Biology of Reproduction, Vol 18, 428-433, Copyright © 1978 by Society for the Study of Reproduction

The Effect of Disconnecting the Uterus and Ovary on the Length of Gestation in the Pig

PAUL A. MARTIN 1, GREGG W. BEVIER 1, , and PHILIP J. DZIUK 1

1 Department of Animal Science, University of Illinois, Urbana, Illinois 61801


The normal anatomical relationship between the uterus and the ovary was altered surgically in gilts by transplanting the ovary to the uterus or the abdominal wall, or by removing 1 uterine horn and its contralateral ovary. Pregnancy was established in 14 of 92 experimental gilts. The length of gestation, farrowing, lactation and the level of estrogen and progesterone late in gestation were all normal in these 14 gilts. The decline in progesterone near the time of parturition in the experimental gifts indicates that the corpora lutea regressed at term. We conclude that in the pig, the usual connection between the uterus and the ovary is not an absolute requirement for maintenance of pregnancy and normal parturition.

Note:
ACKNOWLEDGMENTS We wish to thank Dr. Horace W. Norton for his assistance with the statistical analyses of these data and Mrs. Lei-Hwa Yen for technical assistance with the estrogen and progesterone assays.

Submitted on July 23, 1977
Accepted on September 21, 1977






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Copyright © 1978 by the Society for the Study of Reproduction.