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The use of GNRH to control follicular development in cows

Published online by Cambridge University Press:  05 November 2021

A.R. Peters ,
S.J. Ward ,
P.J. Gordon  and
G.E. Mann
A.R. Peters
Affiliation:
Royal Veterinary College, Boltons Park, Potters Bar, Hertfordshire EN6 1NB, UK
S.J. Ward
Affiliation:
Royal Veterinary College, Boltons Park, Potters Bar, Hertfordshire EN6 1NB, UK
P.J. Gordon
Affiliation:
Royal Veterinary College, Boltons Park, Potters Bar, Hertfordshire EN6 1NB, UK
G.E. Mann
Affiliation:
University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK
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Extract

Fertility after prostaglandin (PG) may be compromised by the variability in timing of oestrus and ovulation, which are in turn influenced by the ovarian follicular status at the time of injection. Gonadotrophin-releasing hormone (GnRH) treatment in the luteal phase a few days before PG can reprogramme and thus synchronise preovulatory follicle development (Wolfenson et al., 1994). A second GnRH treatment can then be given after PG, to further improve the synchrony of ovulation (Pursley et al., 1995). The present experiment was carried out to test the effect of this combined GnRH - PG - GnRH regime on ovarian function and steroid hormone production in dairy cows.

Type
Dairy
Information
Proceedings of the British Society of Animal Science , Volume 1996 , March 1996 , pp. 95
Copyright
Copyright © The British Society of Animal Science 1996

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References

Pursley, J.R., Mee, M.O. and Wiltbank, M.C. 1995. Synchronization of ovulation in dairy cows using PGF2α and GnRH. Theriogenology 44: 915–923.10.1016/0093-691X(95)00279-HCrossRefGoogle ScholarPubMed
Wolfenson, D., Thatcher, W.W., Savio, J.D., Badinga, L. And Lucy, M.C. 1994. The effect of a GnRH analogue on the dynamics of follicular development and synchronization of estrus in lactating cyclic dairy cows. Theriogenology 42: 633–644.10.1016/0093-691X(94)90380-2CrossRefGoogle ScholarPubMed