Sperm penetration of pig eggs in utero.
D000818:Animals; D010064:Embryo Implantation; D004971:Estrus; D005260:Female; D005306:Fertilization; D008297:Male; D010060:Ovulation; D010063:Ovum / Q000502:physiology*; D011247:Pregnancy; D013094:Spermatozoa / Q000502:physiology*; D013552:Swine / Q000502:physiology*; D014599:Uterus / Q000502:physiology*