1. Impedometric properties of the vulvar and vaginal tissues of ewes during the oestrous cycle;Adam;J. Reprod. Fert.,1981
2. Serum levels of FSH during the bovine oestrous cycle;Akbar;J. Anim. Sci.,1974
3. Patterns of Mammalian Reproduction;Asdell,1964
4. Studies on the estrous cycle of dairy cattle;Asdell;Cornell Vet.,1949
5. Pro-oestrous surge in plasma progesterone in the cow;Ayalon;J. Reprod. Fert.,1974