1. Relation of calving-to-service interval to fertility in dairy cows with different reproductive histories, production levels and management practises;Ayalon;Refu. Vet.,1971
2. Milk progesterone levels in relation to conception, repeat breeding and factors influencing acyclicity in dairy cows;Bulman;J. Reprod. Fertil.,1978
3. A high performance, high throughput enzymeimmunoassay for the analysis of progesterone in plasma or milk;Cleere;Ir. Vet. J.,1985
4. A survey of the steroids in cow's milk;Darling;J. Endocrinol.,1974
5. Relationship between progesterone concentrations in milk and plasma during the bovine estrous cycle;Dobson;Vet. Rec.,1975