J. Anim Sci.
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J. Anim Sci. 1973. 37:1191-1194.
© 1973 American Society of Animal Science
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Effects of Ovariectomy, Dexamethasone and Progesterone on the Maintenance of Pregnancy in Swine1

N. L. First and R. B. Staigmiller

University of Wisconsin2, Madison 53706

Abstract

Thirty-two pregnant primiparous sows were studied. The daily injection of 100 mg of dexamethasone on days 101 to 104 of pregnancy shortened the duration of gestation of intact sows. Sham ovariectomy also shortened gestation slightly and ovariectomy at day 102 caused abortion by day 104. Daily injection of 500 mg of progesterone prolonged gestation beyond day 120 in intact and ovariectomized sows. Sows with progesterone treatment withdrawn at day 120 had not farrowed by day 130 when they were autopsied. Some placentas (52%) and a few dead pigs were necrotic at day 120, whereas, nearly all placentas (94%) and pigs were necrotic and dead by day 130. All sows farrowing expelled afterbirth within 24 hours. The time required for parturition was significantly longer for ovariectomized sows. Fewer pigs lived until 2 hr. after birth when parturition was induced by dexamethasone (day 109) and none survived from ovariectomized sows. Dexamethasone caused a reduction in the weight of fetal adrenal glands and the pigs from ovariectomized sows had smaller thymus glands.

Footnotes

1 Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison 53706, The Ciba Giegy Company, Ardsley, New York and by Public Health Service Training Grant No. 2-T01-HD-00104-06 from the National Institute of Child Health and Human Development and by Grant No. 630-0505A from the Ford Foundation.

2 Department of Meat and Animal Science Paper No. 625.






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