Contents: T h e effects o f preappkcation o f seminat plasma before artificial insemination on sperm transport and fertilization rate were examined. T w o sperm concentrations ( A , B: 2 x l o 9 ; C, D: 5 x 10') were compared afterpreinstallation o f seminal plasma ( A , C ) or commercial B S A diluter (B, D). T h e efficiency o f sperm transport was estimated b y the number o f accessory sperms, released f r o m the zona pellucida after Pronasem digestion, t h e percentage o f intact embryos and fertilization rates. I n the presence o f seminal plasma different sperm concentrations per dose did n o t influence the number ofspermatozoa in the zona. However, the preinstallation o f commercial diluter instead o f seminal plasma reduced the number o f accessory sperm cells significantly (more than 120 sperm cells per zona: A : 26% us. B: 5%, C: 2 5 % us. D: 0%). T h e percentage of intact embryos revealed a similar pattern ( A : 92.5 %, B: 75.8 %, C: 84.2 %, D: 82.1 %). Fertilization rates were similar amonggroups. I t is concluded that seminal plasma influences passive sperm transport and subsequent e m b r y o quality. An adequate volume o f seminal plasma in t h e insemination dose allows a reduced number o f spermatozoa per insemination dose without reducing fertilization and e m b r y o quality.
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48 Jungsauen wurden mit Sperma, das in Makrotüb und Flachbehältnissen eingefroren wurde, inseminiert. Unmittelbar vor Besamung wurden den Sauen über den Besamungskatheter Seminalplasma, Östrogenlösung oder Verdünnerlösung intrauterin appliziert. Es zeigte sich eine signifikante Steigerung des Spermientransportes in die Eileiter nach Seminalplasma‐Behandlung, der anhand der Anzahl akzessorischer Spermien in der Zona pellucida festgestellt wurde. Gleichzeitig wurde auch die Befruchtungsrate signifikant erhoht, so daß ein Zusammenhang zwischen Spermientransport und Behchtung hergestellt werden konnte. Im Vergleich zur Seminalplasmabehandlung ergab sich nach Östrogenapplikation eine ähnliche, wenn auch deutlich verminderte Reaktion, so daß die Seminalplasma‐Wirkung nur partiell durch den im Eberseminalplasma in hoher Konzentration uorliegenden Östrogengehalt bedingt sein dürfte. Hinsichtlich der beiden Konfektionsformen erwies sich das Flachbehältnis als geeigneter, da es, allerdings nur teilweise, signifikant höhere akzessorische Spermienzahlen und Behchtungsergebnisse erbrachte.
Contents
Sperm transport and fertilisation in AI with frozen boar semen
48 gilts were inseminated with semen frozen in maxitubes and flattened straws. Immediately before AI an intrauterine infusion of seminalplasma, saline oestrogen solution or buffer medium was applicated. Sperm transport into the oviducts was increased significantly after application of seminal plasma, verified by counting the number of accessory spermatozoa trapped in the zona pellucida. The fertilization rate was increases signvicantly. A positive relationship between sperm transport and fertility could be established. In comparison to the seminal plasma treatment a similar but not so pronounced oestrogen effect could be registrated. The effect of seminal plasma can only partially be explained by oestrogenes, which are present in high concentration in seminal plasma of the boar. Regarding to the different packages used for freezing, flattened straws seemed to be more efficient in consequence of the partially increased number of accessory spermatozoa and fertility rates.
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