title: Penetration of intact bovine ova with ram sperm in vitro.
abstract: In culture, mature bovine ovarian oocytes were fertilized in vitro with freshly ejaculated ram spermatozoa treated with heparin. The zona pellucida does not prevent penetration of ram spermatozoa. The penetration rate varied between 10 and 84%, and in most instances, after 24 hr of culture, two normal-looking pronuclei and sperm tail were present in the cytoplasm. These results suggest that the zona pellucida of bovine oocytes does not represent a barrier for the penetration of ram spermatozoa.
authors.affiliation: Czechoslovak Academy of Sciences, Institute of Animal Physiology and Genetics, Libĕchov, Czechoslovakia.
authors.forename: T
authors.initials: T
authors.lastname: Slavík
authors.forename: A
authors.initials: A
authors.lastname: Pavlok
authors.forename: J
authors.initials: J
authors.lastname: Fulka
mesh_terms: D000818:Animals; D002417:Cattle; D005260:Female; D008297:Male; D009865:Oocytes / Q000166:cytology / Q000502:physiology*; D012756:Sheep; D013045:Species Specificity; D013084:Sperm-Ovum Interactions; D013094:Spermatozoa / Q000166:cytology / Q000502:physiology*