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A stochastic model of the reproductive performance of dairy herds

Published online by Cambridge University Press:  27 March 2009

S. V. Morant
S. V. Morant
Affiliation:
National Institute for Research in DairyingShinfield, Reading, Berkshire, RO2 9AT
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Summary

A model of reproductive performance in dairy herds is described. The model relies upon no empirical relationships but is constructed from a series of simple stochastic processes involving only three principal parameters: ovulation detection rate, pregnancy rate and embryo loss rate. The model shows how the complex interactions between these parameters and management policy concerning the definition of the service period are generated.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 104 , Issue 3 , June 1985 , pp. 505 - 512
Copyright
Copyright © Cambridge University Press 1985

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References

Anon. (1969). The probable consequences of manipulating the herd calving interval. Breeding and Production 19, 120–123.Google Scholar
Anon. (1978). The optimum calving interval. Breeding and Production 28, 96–99.Google Scholar
Bailie, J. H. (1982). The influence of breeding management efficiency on dairy herd performance. Animal Production 34, 315–323.Google Scholar
Bloomfield, G. A., Morant, S. V. & Ducker, M. J. (1985). A survey of reproductive performance in dairy herds: patterns of progesterone concentrations in milk during the ovulatory cycle and in early pregnancy. Animal Production (in the Press).Google Scholar
Ducker, M. J. (1980). The effect of feeding strategy on the reproductive performance of dairy cows. In Feeding Strategies for Dairy Cows (ed. Broster, W. H., Johnson, C. L. and Tayler, J. C.), pp. 13.1–13.2. London: Agricultural Research Council.Google Scholar
Feller, W. (1970). An Introduction to Probability Theory and its Applications, 3rd ed. Vol. 1. New York: John Wiley & Sons Inc.Google Scholar
James, A. D. & Esselmont, R. J. (1979). The economics of calving intervals. Animal Production 29, 157–162.Google Scholar
Mobero, G. P. (1975). Effects of environment and management stress on reproduction in the dairy cow. Journal of Dairy Science 59, 1618–1624.CrossRefGoogle Scholar
Morant, S. V. (1983). The stochastic properties of calving patterns in dairy herds. Ph.D. thesis, University of Reading.Google Scholar
Morant, S. V. (1984). Factors affecting reproductive performance including the importance and effect of problem cows. Dairy Cow Fertility, pp. 15–23. Proceedings of Joint BVA/BSAP Conference, Bristol, 06 1984.Google Scholar
Morant, S. V., Bloomfield, G. A. & Ducker, M. J. (1985). A survey of reproductive performance in dairy herds: the analysis of reproductive performance and the interpretation of progesterone profiles. Animal Production (in the Press).Google Scholar