PMID: 9231235Jan 1, 1997Paper

Influence of varied progestogen treatments on ovarian follicle status and subsequent ovarian superstimulatory responses in cows

Animal Reproduction Science
M J D'OcchioJ E Kinder

Abstract

The influence of ovarian follicle status and follicle dominance on the response to superstimulatory treatment with FSH was examined in cows. In Experiment 1, oestrus was synchronised using Crestar and on Days 4-6 of the ensuing oestrous cycle cows were assigned to: Group NO (n = 9), control, endogenous CL and no treatment; Group N1 (n = 15), injected with a luteolytic dose of cloprostenol (500 micrograms) and implanted with one implant (3 mg) of the synthetic progestogen, norgestomet; Group N8 (n = 18), injected with 500 micrograms cloprostenol and implanted with eight (24 mg) implants of norgestomet. On Days 9-11, seven implants were removed from six cows in Group N8 and these cows, plus eight Group N1 and all Group N0 cows, were superstimulated with porcine FSH (Folltropin-V) over 4 days (360 mg total dose). The remaining implants were removed from cows in Groups N1 and N8 on Days 11-13, and all cows received 500 micrograms cloprostenol. Numbers and sizes of ovarian follicles, and CL, were recorded by trans-rectal ultrasonography; the largest follicle > 10 mm in diameter was considered morphologically dominant (DF). On Days 9-11, the proportions of cows with a DF were: Group N0, 3/9; Group N1, 14/15; Group N8, 0/18. Total fol...Continue Reading

References

Jan 1, 1991·Journal of Reproduction and Fertility·L A GuilbaultP Matton
Oct 1, 1993·Molecular Reproduction and Development·M P Boland, J F Roche
Nov 1, 1993·Theriogenology·B PurwantaraH Callesen

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Citations

Jan 18, 2008·Reproduction in Domestic Animals = Zuchthygiene·A Veiga-LopezA Gonzalez-Bulnes

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