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Effect of low progesterone concentration during oestrus synchronisation on subsequent ovulation and postovulatory endocrine function in dairy cows

Published online by Cambridge University Press:  20 November 2017

G.E. Mann ,
E.C.L. Bleach  and
M.D. Fray
G.E. Mann*
Affiliation:
University of Nottingham, School of Biosciences, Sutton Bonington, Loughborough, LE12 5RD, UK
E.C.L. Bleach
Affiliation:
School of Animal and Microbial Sciences, University of Reading, Reading, RG6 6AJ, UK.
M.D. Fray
Affiliation:
Institute for Animal Health, Compton, Newbury, RG20 7NN, UK.
*
E-mail: George.Mann@Nottingham.ac.uk
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Extract

In addition to work showing a detrimental effect of low postovulatory progesterone on embryo development (Mann and Lamming, 2001), a number of studies have demonstrated reduced fertility in animals in which plasma progesterone concentrations were low during the cycle preceding insemination (Holness et al., 1981; Folman et al., 1990). In this study we investigated the effect of reduced progesterone concentrations during oestrus synchronisation on the timing of ovulation and on progesterone concentrations during the ensuing cycle.

Type
Theatre Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2004 , 2004 , pp. 60
Copyright
Copyright © The British Society of Animal Science 2004

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References

Folman, Y, Kaim, M, Herz, Z and Rosenberg, M (1990) Comparison of methods for synchronization of oestrous cycles of dairy cows. 2. Effects of progesterone and parity on conception Journal of Dairy Science 73 2817–2825 Google Scholar
Holness, DH, Sprowson, GW, Sherward, C and Geel, G (1981) Studies on plasma progesterone concentrations and fertility in Friesland dairy cows during the post-partum period Journal of Agricultural Science (Cambridge) 97 649–655 Google Scholar
Mann, GE and Lamming, GE (2001) Relationship between the maternal endocrine environment, early embryo development and the inhibition of the luteolytic mechanism in the cow. Reproduction 121, 175– 180.CrossRefGoogle Scholar