In the last decennia, artificial insemination (A. I.) in swine has made little or no progress and natural breeding still plays an important role in porcine reproduction. When reproductive failures have to be scrutinized under conditions of natural breeding, it is often very hard, if not impossible, to split up the male factor in its main components. Theoretically reduced fertility can be due either to impaired fertilization or to increased embryonic mortality (E.M.). Fertilization itself can be deficient either by inadequate intrauterine deposition of the semen during coition or by absence of ovum penetration. So we developed a simple experimental procedure to differentiate between coital impotence, lack of fertilization or increased E. M. in 13 belgian landrace boars with normal ejaculated spermatozoa at routine semen evaluation.

R. Bouters, P. Bonte, M. Vandeplassche

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 3, Madrid, Spain, 169–171, 1974
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