Differing sperm ability to penetrate the oocyte in vivo and in vitro as revealed using colloidal preparations

The penetration ability of boar (Sus scrofa domestica) spermatozoa exposed to viscous preparations under in vivo and in vitro fertilization conditions has been examined. Experiments involving induced ovulation in prepubertal animals and surgical insemination directly into the oviduct isthmus reveale...

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