1. Official methods of analysis,1980
2. Dairy cattle: Principles, practices, problems, profits;Bath,1978
3. A clinical study of cystic conditions of the bovine ovary;Bierschwal;J. Am. Vet. Med. Assoc.,1966
4. Clinical response of dairy cows with ovarian cysts to GnRH;Bierschwal;J. Anim. Sci.,1975
5. Effects of β-carotene on metabolic and reproductive parameters in lactating dairy cows;Bremel;J. Dairy Sci.,1982