1. Effects of human chorionic gonadotrophin hormone upon conception in the dairy herd;Babler;J. Dairy Sci.,1974
2. Increasing pregnancy rates of heifers with human chorionic gonadotropin;Brown;J. Amer. Vet. Med. Ass.,1973
3. Conception rate of repeat breeder cows after progesterone and chorionic gonadotropin treatments at estrus;Hansel;Cornell Vet.,1960
4. Diagnosis and prevention of infertility in cattle;Morrow;J. Dairy Sci.,1970
5. Herd breeding problems and their consequences;Pelissier;J. Dairy Sci.,1972