Allison, A. J. 1972. The effect of mating pressure on characteristics of the ejaculate in rams and on reproductive performance in ewes. Proc. N.Z. Soc. Anim. Prod. 32: 112–113.
Allison, A. J. and Robinson, T. J. 1971. Fertility of progestagen-treated ewes in relation t o the numbers and concentration of spermatozoa in the inseminate. Aust. J. biol. Sci. 24: 1001–1008.
Amir, D. 1966. The effect of successive ejaculations at different seasons on some semen characteristics of Awassi rams. Ktavim 16: 41–44.
Bryant, M. J. and Tomkins, T. 1975. The flock-mating of progestagen-synchronized ewes. 1. The influence of ram-to-ewe ratio upon mating behaviour and lambing performance. Anim. Prod. 20: 381–390.
Chang, M. C. 1945. The sperm production of adult rams in relation to frequency of semen collection. J. agric. Sci., Camb. 35: 243–246.
Comstock, R. E., Green, W. W., Winters, L. M. and Nordskoo, A. W. 1943. Studies of semen and semen production. Tech. Bull. Minn, agric. Exp. Stn, No. 162.
Hulet, C. V. and Ercanbrack, S. K. 1962. A fertility index for rams. J. Anim. Sci. 21: 489–493.
Mattner, P. E. and Braden, A. H. W. 1967. Studies in flock mating of sheep. 2. Fertilization and prenatal mortality. Aust. J. exp. Agric. Anim. Husb. 7: 110–116.
Nelson, E. A. 1958. Factors influencing semen quality and reproductive efficiency in rams. Diss. Abstr. 18: 1192 (Abstr.).
Pepelko, W. E. and Clegg, M. T. 1965. Studies of mating behaviour and some factors influencing the sexual response in the male sheep Ovis aries. Anim. Behav. 13: 249–258.
Quinlivan, T. D. 1970. The relationship between numbers of spermatozoa inseminated and fertilization rate of ova in ewes treated with fluoro-progestagen intra-vaginal sponges in summer and autumn. J. Reprod. Fert. 23: 87–102.
Robinson, T. J. 1967. Control of the ovarian cycle in the sheep. In Reproduction in the Female Mammal (ed. Lamming, G. E. and Amoroso, E. C.). Proc. 13th Easter School in Agricultural Science, Univ. Nottingham, 1966, pp. 373–418. Butterworth, London.
Salamon, S. 1962. Studies on the artificial insemination of Merino sheep. III. The effect of frequent ejaculation on semen characteristics and fertilizing capacity. Aust. J. agric. Res. 13: 1137–1150.
Salamon, S. 1964. The effect of frequent ejaculation in the ram on some semen characteristics. Aust. J. agric. Res. 15: 950–960.
Salamon, S. and Lindsay, D. R. 1962. The training of rams for the artificial vagina, with some observations on ram behaviour. In Artificial Breeding of Sheep in Australia. Proc. Conf. Univ. New South Wales, 1961 (ed. Roberts, E. M.) pp. 173–182, University of New South Wales.
Schindler, H., Volcani, R. and Eyal, E. 1957. Some characteristics of the semen of Awassi rams. Ktavim 5: 45–51.
Smyth, P. and GORDON, 1.1967. Seasonal and breed variations in the semen characteristics of rams in Ireland. Ir. vet. J. 21: 222–233.
Wiggins, E. L., Terrill, C. E. and Emik, L. O. 1953. Relationships between libido, semen characteristics and fertility in range rams. J. Anim. Sci. 12: 684–696.