title: Twinning in lactating Friesian cows by non-surgical egg transfer.
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D005260:Female; D007774:Lactation; D010063:Ovum / Q000637:transplantation*; D011247:Pregnancy; D011270:Pregnancy, Animal; D011817:Rabbits; D014184:Transplantation, Homologous; D014427:Twins