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SPERM PENETRATION OF PIG EGGS IN UTERO

Summary.: Boar spermatozoa fertilized only a small proportion of the follicular and ovulated eggs that were transferred into the uterus of artificially inseminated gilts. The possibility that spermatozoa had entered the oviduct or were influenced by tubal secretions before penetration cannot be excluded. Sperm penetration in utero was not observed when oviducts were ligated at the uterotubal junction before transferring eggs into the uterus.