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Induction of ovulation with GnRH or oestradiol benzoate lowers plasma progesterone concentration within the first week of ovulation in non-lactating Holstein cows

Published online by Cambridge University Press:  20 November 2017

B.V.E. Segwagwe ,
K.L. Macmillan  and
P.D. Mansell
B.V.E. Segwagwe
Affiliation:
Faculty of Veterinary Science, The University of Melbourne, 250 Princes Highway, Werribee, 3030, VIC, Australia
K.L. Macmillan
Affiliation:
Faculty of Veterinary Science, The University of Melbourne, 250 Princes Highway, Werribee, 3030, VIC, Australia
P.D. Mansell
Affiliation:
Faculty of Veterinary Science, The University of Melbourne, 250 Princes Highway, Werribee, 3030, VIC, Australia
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Extract

Oestrous synchronisation involves synchronisation of ovarian follicular turnover, new wave emergence, and finally induction of ovulation which can be achieved with an injection of either GnRH (Pursley et al. 1997)or oestradiol benzoate (ODB) (Day et al. 2000). A comparative study investigating corpus luteum (CL) and follicular emergence after the administration of either GnRH or ODB at pro-oestrus has not been reported. It was hypothesised that the injection of ODB at pro-oestrus would delay emergence of the first post-ovulatory follicular wave, but that CL development and plasma progesterone concentrations would be similar in cows induced to ovulate with either GnRH or ODB.

Type
Theatre Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2003 , 2003 , pp. 1
Copyright
Copyright © The British Society of Animal Science 2003

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References

Day, M.L., Burke, C.R., Taufa, V.K., Day, A.M. and Macmillan, K.L. (2000) The strategic use of estradiol to enhance fertility and submission rates of progestin-based estrus synchronization programs in dairy herds. Journal of Animal Science 78:523-529.CrossRefGoogle ScholarPubMed
Pursley, J.R., Wiltbank, M.C., Stevenson, J.S., Ottobre, J.S., Garverick, H.A. and Anderson, L.L. (1997) Pregnancy rates per artificial insemination for cows and heifers inseminated at a synchronized ovulation or synchronized estrus. Journal of Dairy Science 80:295-300.CrossRefGoogle ScholarPubMed