1. Some effects of progesterone on estrus behaviour and fertility in the ewe;Foote;J. Anim. Sci.,1965
2. Comparison of medroxy-progesterone acetate orally and in vaginal sponges for synchronizing estrus in ewes;Deweese;J. Anim. Sci.,1970
3. Fertility in progestogen-treated ewes inseminated with fresh or frozen semen in the breeding season;Colas,1972
4. The use of progestogen-containing vaginal pessaries in stimulating estrus in sheep. I. Synchronization of estrus in mating season;Veradin;Veterinaria Yugoslavia,1973
5. The fertility of nulliparous anestrus ewes synchronized for estrus late in autumn, after the end of the breeding season;Tsakalof,1974