PMID: 11914116Mar 27, 2002Paper

Plasma FSH, inhibin A and inhibin isoforms containing pro- and -alphaC during winter anoestrus, spring transition and the breeding season in mares

Reproduction : the Official Journal of the Society for the Study of Fertility
Elaine D WatsonS C Riley

Abstract

Ten mares were studied from February (winter anoestrus) to their second ovulation in the breeding season to investigate the relationship between resumption of ovarian cyclicity in the spring and circulating concentrations of FSH, inhibin A and inhibin isoforms containing pro- and -alphaC immunoreactivity. An additional four mares were studied during one oestrous cycle. Growth and regression of ovarian follicles were monitored by transrectal ultrasonography. The frequency of blood sampling varied from three times a week to once a day, depending on the follicular activity present. Concentrations of FSH, oestradiol, inhibin A and pro- and -alphaC isoforms were low during deep winter anoestrus when minimal follicular activity was present in the ovaries. During spring transition, an increase in FSH concentration preceded the emergence of each follicular wave. Concentrations of inhibins were significantly higher (P < 0.05) during growth of anovulatory follicles in spring transition than during winter anoestrus. Plasma concentrations of oestradiol and inhibin A were significantly higher (P < 0.001, P < 0.05, respectively) during the growth of preovulatory follicles than during the growth of transitional anovulatory follicles, but conc...Continue Reading

Citations

Jun 24, 2003·Animal Reproduction Science·O J GintherD R Bergfelt
Dec 31, 2008·General and Comparative Endocrinology·Julie TownsendDomingo J Tortonese
Jan 9, 2007·Animal Reproduction Science·F X Donadeu, E D Watson
Jul 25, 2008·Reproduction in Domestic Animals = Zuchthygiene·F X Donadeu, H G Pedersen

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