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Influence of Estradiol-17ß on Fertility in Confined Sheep Inseminated with Frozen Semen^{1, 2,}

Animal Research Institute, Agriculture Canada, Ottawa, Ontario K1A 0C6

Abstract

Impaired sperm transport is believed to be a major cause of reduced fertility in ewes inseminated with frozen semen. Because of suggestions that estradiol improves sperm transport, estradiol-17ß was given to mature ewes at progestagen-induced estrus to test effects on fertility after artificial insemination with frozen semen. Conception rates, based on progesterone determinations made 18 days after insemination, were 43% for ewes injected with 50 µg estradiol-17ß and inseminated with frozen semen, 52% for ewes inseminated with frozen semen but given no estradiol and 86% for ewes inseminated with fresh semen. Lambing rates were 6, 35 and 69%, respectively. The markedly greater difference between conception rates and lambing rates for the estradiol-treated ewes suggests that estradiol caused a substantial increase in the early embryonic mortality associated with the use of frozen semen.

¹ Contribution no. 881, Animal Research Institute; contribution no. 1–144, Engineering and Statistical Research Institute.

² We wish to thank Dr. D. P. Heaney for assistance in inseminations; J. Arcand, J. F. Hunter and D. Ostapyk for care of animals, and P. Panich and B.Graham for technical assistance.

³ Statist. Res. Sec, Engineering and Statistical Research Institute, Agricultural Canada, Ontario, K1A 0C6.

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