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Transport and Loss of Boar Spermatozoa in the Reproductive Tract of the Sow^{1, 2,}

University of Wisconsin, Madison³

Abstract

Twenty-five yearling sows were slaughtered , 2, 4, 8 or 24 hr. after insemination. Spermatozoa were recovered and counted from the uteri and oviducts and uterine fluids were measured. There was no significant difference in the volume of recoverable uterine fluid among the time periods. There was no significant difference in the number of spermatozoa recovered from the left or right uterine horns. Approximately 40% of the spermatozoa inseminated were recovered from the uterus 15 min. after insemination. A rapid and significant loss of spermatozoa from the uterus occured through 24 hr. after artificial insemination (A.I.). Seventy-eight percent of the spermatozoa in the uterus 15 min. after A.I. were not recoverable by 2 hr. after A.I. The yellow color of the extender media was not visible by 4 hr. and phagocytosis of spermatozoa was first observed at 8 hr. after A.I. Motility of spermatozoa recovered from the uteri was drastically reduced beyond 2 hr. after A.I. There was no significant difference in the number of oviducts frorn which spermatozoa could be recovered or in the number of spermatozoa recovered from the oviducts at each of the time periods.

Six sows were inseminated with live and six with dead boar spermatozoa. Thirty minutes after insemination spermatozoa were recovered from oviducts of sows inseminated with both kinds of spermatozoa. There was no significant difference in the number of spermatozoa recovered from the upper or from the lower half of the oviducts.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station, Madison.

² This study was supported in part by grants from Badger Breeders Cooperative, Tri-State Breeders Cooperative, the American Meat Institute and the Murphy Products Company.

³ Department of Meat and Animal Science Paper No. 479.

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