1. Ability of castrate male sheep treated with oestrogen or testosterone to induce and detect oestrus in ewes;Fulkerson;Appl. Anim. Ethol.,1981
2. Effects of the ram early in the breading season on the incidence of ovulation and oestrus in sheep;Hunter,1967
3. Synchronized mating and lambing in spring-bred Merino sheep: The use of progestogen-impregnated intravaginal sponges and teaser rams;Hunter;Agroanimalia,1971
4. The importance of the ram on flock fertility;Kilgour;Wool Tech. Sheep Breed,1979
5. Sexual activity in the ewe following isolation from the ram during the breeding season;Lishman;S. Afr. J. Agric. Sci.,1966