Bekeová, E [Concentrations of thyroxine, beta carotene, vitamin A and pregnancy in heifers after administration of beta carotene]. [electronic resource] - Veterinarni medicina Dec 1985 - 715-24 p. digital Publication Type: English Abstract; Journal Article ISSN: 0375-8427 Subjects--Topical Terms: AnimalsCarotenoids--bloodCattle--bloodFemaleFertilization--drug effectsInsemination, Artificial--veterinaryPregnancyThyroxine--bloodVitamin A--bloodbeta Carotene