J. Anim Sci.
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J. Anim Sci. 1968. 27:131-133.
© 1968 American Society of Animal Science
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Attempts to Overcome the Anti-Fertility Effect of Intrauterine Plastic Spirals in the Ewe1

J. E. Warren, Jr.2 and H. W. Hawk

U. S. Department of Agriculture

Abstract

Forty-four parous, western ewes were unilaterally ovariectomized, and a plastic spiral was inserted into the uterine horn opposite to the remaining ovary. Spirals were immediately removed from five ewes. At the time of mating, 2 wk. to 3 mo. post surgery, sham-operated and spiral control ewes were injected with saline solution. Ewes with spirals were injected with either estradiol, epinephrine, oxytocin, oxytocin and acetylcholine, or oxytocin, acetylcholine and physostigmine. Other ewes with spirals were laparotomized, and either the uterus was massaged or the cervical lumen was cleaned.

Three days post-mating, eight ova recovered from five sham-operated ewes were all cleaved, with a mean of 90 accessory sperm in the zonae pellucidae.

Three of 12 ova recovered from eight spiral control ewes were cleaved. Only one of 40 ova recovered from 28 treated ewes was cleaved. Accessory sperm were not found in either cleaved or uncleaved ova from any spiral ewe. None of the treatments overcame the antifertilization effect of the spiral.

Footnotes

1 A.R.S., Animal Husbandry Research Division, Beltsville, Maryland. This investigation was supported in part by a reimbursable agreement with the National Institute of Child Health and Human Development, NIH, Bethesda, Maryland.

2 The authors gratefully acknowledge the suggestions of T. H. Brinsfield and the technical assistance of H. H. Conley, B. S. Cooper and D. K. Higginbotham.






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Copyright © 1968 by the American Society of Animal Science.