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2. Copulatory behaviour of the ram, Ovis aries. II: factors affecting copulatory satiation;Beamer;Anim. Behav.,1969
3. Evans, G., Maxwell, W.M.S., 1989. Salamons Artificial Insemination of Sheep and Goats, University Press, Sydney, NSW, Australia.
4. The effect of dominance and infertility of rams on reproductive performance;Fowler;Appl. Anim. Ethol.,1976
5. Fraser, A.F., Broom, D.M., 1998. Domestic Animal Behaviour and Welfare, 3rd Edition. CAB International, NY, p. 437.