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Trends in the fertility of dairy cows in the United Kingdom

Published online by Cambridge University Press:  20 November 2017

M.D. Royal
Affiliation:
Cattle Fertility Research Group, School of Biological Sciences, Division of Animal Physiology, The University of Nottingham, Sutton Bonington, Loughborough, Leicestershire, LE12 5RD
A.O. Darwash
Affiliation:
Cattle Fertility Research Group, School of Biological Sciences, Division of Animal Physiology, The University of Nottingham, Sutton Bonington, Loughborough, Leicestershire, LE12 5RD
G.E. Lamming
Affiliation:
Cattle Fertility Research Group, School of Biological Sciences, Division of Animal Physiology, The University of Nottingham, Sutton Bonington, Loughborough, Leicestershire, LE12 5RD
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Extract

The gain in genetic merit for milk production in the US (Foote, 1996) has been accompanied by a decline in conception to first service of approximately 0.45% per year (between 1975-1997, Butler and Smith, 1989; Beam and Butler, 1998). A similar trend is anticipated in the UK. Lamming and Darwash (1998) reported that defective ovarian function prior to insemination contributes to lower reproductive efficiency. In particular, persistent luteal activity was associated with reduced fertility and a higher incidence of late embryo mortality (embryonic death after day 16 post-insemination). The objectives of this study are firstly, to determine the current incidence of atypical ovarian hormone patterns and secondly, to make specific comparisons between the present results and those of our previous study.

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Programme
Copyright
Copyright © The British Society of Animal Science 1999

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References

Butler, W.R. and Smith, R, D.(1989). Interrelationships between energy balance and post-partum reproductive function in dairy cattle. Journal of Dairy Science. 72, 767783.Google Scholar
Beam, S.W. and Butler, W.R. (1998). Energy balance effects on follicular development and first ovulation in post-partum cows. Journal of Reproduction and Fertility. Suppl. 54. (in press).Google Scholar
Darwash, A.O., Lamming, G.E. and Woolliams, J.A.(1998). The potential for identifying heritable endocrine parameters associated with fertility in post-partum dairy cows. Animals Science (in press).Google Scholar
Foote, R.H. (1996). Review: Dairy cattle reproductive physiology research and management-Past progress and future prospects. Journal of Dairy Science. 79, 980990.Google Scholar
Lamming, G.E. and Darwash, A.O. (1998). The use of milk progesterone profiles to characterise components of subfertility in milked dairy cows. Animal Reproduction Science. 52, 175190.Google Scholar
National Dairy Council (NDC). Dairy Facts and Figures (1976, 1997). NDC. London.Google Scholar