Fertility of superovulated ewes after intrauterine or oviducal insemination with low numbers of fresh or frozen-thawed spermatozoa [sheep]
1993
Maxwell, W.M.C. | Evans, G. | Rhodes, S.L. (Sydney Univ. (Australia). Dept. of Animal Science) | Hillard, M.A. | Bindon, B.M. (Commonwealth Scientific and Industrial Research Organisation, Armidale (Australia). Div. of Animal Production)
Two experiments investigated the effects of number of spermatozoa inseminated and time and site of insemination of fresh and frozen-thawed semen on fertility in Merino ewes treated with intravaginal progestagen pessaries and a combination of pregnant mare serum gonadotrophin and follicle stimulating hormone. The study showed that fertilized ova can be obtained after deposition of 10,000 fresh spermatozoa in the oviducts of superovulated ewes, and that the minimum effective dose is between 100,000 and 1 million fresh spermatozoa.
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