Follicle-stimulating hormone isoforms and plasma concentrations of estradiol and inhibin A in dairy cows with ovulatory and non-ovulatory follicles during the first postpartum follicle wave

Domestic Animal Endocrinology
Stephen T ButlerW R Butler

Abstract

Following parturition, all cows display a wave of ovarian follicular growth, but a large proportion fail to generate a preovulatory rise in estradiol, and hence fail to ovulate. Follicle-stimulating hormone (FSH) exists as multiple isoforms in the circulation depending on the type and extent of glycosylation, and this has pronounced effects on its biological properties. This study examined differences in plasma FSH, estradiol, and inhibin A concentrations, and the distribution of FSH isoforms in cows with ovulatory or atretic dominant follicles during the first postpartum follicle wave. Plasma FSH isoform distribution was examined in both groups during the period of final development of the dominant follicle by liquid phase isoelectric focusing. Cows with an ovulatory follicle had higher circulating estradiol and inhibin A concentrations, and lower plasma FSH concentrations. The distribution of FSH isoforms displayed a marked shift toward the less acidic isoforms in cows with ovulatory follicles. A higher proportion of the FSH isoforms had a pI>5.0 in cows with ovulatory follicles compared to those with atretic follicles. In addition, cows with ovulatory follicles had greater dry matter intake, superior energy balance, elevated...Continue Reading

References

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Dec 1, 1995·Endocrine Reviews·A Ulloa-AguirreV Padmanabhan
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Mar 30, 2001·Reproduction : the Official Journal of the Society for the Study of Fertility·P G Knight, C Glister
Dec 26, 2001·Archives of Medical Research·A Ulloa-AguirreC Timossi
Jul 31, 2003·Reproduction : the Official Journal of the Society for the Study of Fertility·Shyr-Yeu LinDavid M de Kretser
Aug 4, 2006·Reproduction : the Official Journal of the Society for the Study of Fertility·Phil G Knight, Claire Glister

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Citations

Mar 14, 2009·Theriogenology·A T PeterD J Ambrose
Aug 16, 2008·Domestic Animal Endocrinology·M A VelazquezD C Wathes
Jan 14, 2018·Reproduction in Domestic Animals = Zuchthygiene·K A CampenCmh Combelles
Feb 14, 2018·Journal of Molecular Endocrinology·Nandana Das, T Rajendra Kumar

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