1. Possible role of beta-carotene in improving fertility in dairy cattle;Hemken;J. Dairy Sci.,1982
2. Steroids and Terpenoids;Goodman,1969
3. Importance of beta-carotene for bovine fertility;Lotthammer,1978
4. Animal Nutrition;Maynard,1979
5. A study of the relationship between beta-carotene and fertility problems in dairy cows;Cooke;Brit. Soc. Anim. Prod.,1978