Sperm selection and competition in pigs may be mediated by the differential motility activation and suppression of sperm subpopulations within the oviduct

Abstract excerpt

When spermatozoa from two or more boars are mixed and females inseminated, the resulting litters are often skewed in favour of one male but there is currently no satisfactory physiological explanation for this effect. However, to reach the oocytes, the spermatozoa must enter the oviduct where they are exposed to factors that modulate their activity. They either become sequestered within the oviductal sperm...

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