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Influence of mating pressure and season on the semen characteristics of rams

Published online by Cambridge University Press:  02 September 2010

T. Tomkins  and
M. J. Bryant
T. Tomkins
Affiliation:
Department of Agriculture and Horticulture, University of Reading, Earley Gate, Reading, RG6 2AT
M. J. Bryant
Affiliation:
Department of Agriculture and Horticulture, University of Reading, Earley Gate, Reading, RG6 2AT
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Summary

Two groups of 4 Suffolk rams were each subjected to mating pressures of 90 ejaculates (High) and 45 ejaculates (Low) over a 3-day period during summer and autumn. Every sixth (High) or every third (Low) ejaculate was collected into an artificial vagina and assessed for volume, sperm density, total sperm per ejaculate, motility and percentage of live and abnormal sperm.

There was a general lowering of semen quantity and quality with successive ejaculations. Rate of change of the various measures was greater on the High than on the Low mating pressure. Volume and percentage of live sperm showed a greater decline, and percentage of abnormal sperm a greater increase, during the autumn than during the summer. Density showed a greater decline in summer than in autumn.

The significance of the changes in semen characteristics observed is considered in relation to requirements for high fertility after pro-gestagen treatment.

Type
Research Article
Information
Animal Production , Volume 22 , Issue 3 , June 1976 , pp. 371 - 378
Copyright
Copyright © British Society of Animal Science 1976

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References

REFERENCES

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.Google Scholar
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.CrossRefGoogle Scholar
Amir, D. 1966. The effect of successive ejaculations at different seasons on some semen characteristics of Awassi rams. Ktavim 16: 41–44.Google Scholar
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.CrossRefGoogle Scholar
Chang, M. C. 1945. The sperm production of adult rams in relation to frequency of semen collection. J. agric. Sci., Camb. 35: 243–246.CrossRefGoogle Scholar
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.Google Scholar
Hulet, C. V. and Ercanbrack, S. K. 1962. A fertility index for rams. J. Anim. Sci. 21: 489–493.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar
Nelson, E. A. 1958. Factors influencing semen quality and reproductive efficiency in rams. Diss. Abstr. 18: 1192 (Abstr.).Google Scholar
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.CrossRefGoogle ScholarPubMed
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.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar
Salamon, S. 1964. The effect of frequent ejaculation in the ram on some semen characteristics. Aust. J. agric. Res. 15: 950–960.CrossRefGoogle Scholar
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.Google Scholar
Schindler, H., Volcani, R. and Eyal, E. 1957. Some characteristics of the semen of Awassi rams. Ktavim 5: 45–51.Google Scholar
Smyth, P. and GORDON, 1.1967. Seasonal and breed variations in the semen characteristics of rams in Ireland. Ir. vet. J. 21: 222–233.Google Scholar
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.CrossRefGoogle Scholar