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Influence of sperm number and seminal plasma on fertility of progestagen-treated sheep in confinement.
J Reprod Fertil ; 65(2): 325-9, 1982 Jul.
Article en En | MEDLINE | ID: mdl-6178823
Progestagen-impregnated vaginal sponges + PMSG were used to synchronize oestrus in crossbred adult ewes which were inseminated 56 h after sponge removal with 0.5 ml diluted semen containing 400, 200, 100, 50 or 25 x 10(6) spermatozoa per insemination. The diluent was skim milk-citrate or pooled seminal plasma. There was no difference in reproductive performance due to the insemination medium. Fertility (no. of ewes lambing) after insemination of 400 or 200 x 10(6) spermatozoa was 68% and was similar to that observed after natural service at progestagen-induced oestrus. When less than or equal to 100 x 10(6) spermatozoa were inseminated, fertility fell markedly and the number of lambs per ewe inseminated decreased. A decrease in litter size also occurred. The data indicate that insemination of 200 x 10(6) spermatozoa, i.e. less than 10% of the number in a single ram ejaculate, allows normal conception rates in progestagen-treated ewes.
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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Semen / Recuento de Espermatozoides / Ovinos / Inseminación Artificial / Fertilidad Límite: Animals / Pregnancy Idioma: En Revista: J Reprod Fertil Año: 1982 Tipo del documento: Article Pais de publicación: Reino Unido
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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Semen / Recuento de Espermatozoides / Ovinos / Inseminación Artificial / Fertilidad Límite: Animals / Pregnancy Idioma: En Revista: J Reprod Fertil Año: 1982 Tipo del documento: Article Pais de publicación: Reino Unido