Systemic concentrations of hormones during the development of follicular waves in mares and women: a comparative study

Abstract

Changes in systemic concentrations of FSH, LH, oestradiol and progesterone during the ovulatory follicular wave were compared between 30 mares and 30 women. Based on a previous study, the emergence of the future ovulatory follicle was defined as occurring at 13.0 mm in mares and 6.0 mm in women, and deviation in diameter between the two largest follicles was expected to begin at 22.7 mm in mares and 10.3 mm in women. Mean FSH concentrations were high in mares during the luteal phase, resulting from statistically identified FSH surges occurring in individuals on different days and in different numbers (mean, 1.5 6 0.2 surges/mare); the internadir interval was 3.9 6 0.3 days. In contrast, mean FSH in women was low during the luteal phase and increased to a prolonged elevation during the follicular phase. The prolonged elevation was apparent in each individual (internadir interval, 15.2 6 0.4 days). Changes in LH or oestradiol concentrations encompassing deviation were not detected in mares, but both hormones increased slightly but significantly between emergence and deviation in women. The hypothesis that a greater number of growing follicles causes a greater predeviation decrease in FSH was supported for mares (r, 2 0.39; P < 0.04), but a similar negative correlation (r, 20.36) was not significant in women. The hypothesis that the increase in oestradiol during the luteal phase in women was at least partly attributable to luteal-phase anovulatory follicular waves was not supported. Normalization of FSH concentrations to the day of emergence showed maximum value on the day of emergence with a significant increase and decrease on each side of emergence in both species. The day of expected deviation occurred 3 days after emergence during the decline in FSH in both species. These results indicated that the previously reported striking similarities in emergence and deviation between mares and women during the ovulatory follicular wave are associated with species similarities in the temporal relationships between follicle events and FSH concentration changes. Thus, mares may be useful research models for studying the role and mechanism of the action of FSH in emergence and deviation during the ovulatory follicular wave in women.

Follicular blood flow, antrum growth and angiogenic mediators in mares from ovulation to deviation

“…Contrary to our results, increased estradiol for 2 days after deviation was characterizing multiple ovulatory follicles development (Ginther et al, 2009). As well as, peripheral estradiol concentrations have been reported to increased near (Donadeu and Ginther, 2004), after (Ginther et al, 2005) the beginning of natural deviation, on the same day as the beginning of deviation (Ginther et al, 2007) or by 2 days after deviation (Ginther et al, 2009). …”

Ovarian and PGF2α responses to stimulation of endogenous PRL pulses during the estrous cycle in mares

“…The intra-and interassay CV and sensitivity were 5.1%, 19.9%, and 9.5 pg/mL, respectively. Plasma P4 was measured by a solidphase RIA kit containing antibody-coated tubes and I 125 -labeled progesterone (Coat-A-Count Progesterone; Diagnostic Products Corporation, Los Angeles, CA, USA), validated and described for equine plasma in our laboratory [35]. The intra-assay CV and sensitivity were 3.9% and 0.03 ng/mL, respectively.…”

Follicle selection in cattle and horses: role of intrafollicular factors

“…In this regard, the relative follicle diameters throughout the ovulatory wave are also similar between mares and women (Ginther et al 2004a). In addition, the temporal relationships between follicle deviation and the follicle-stimulating hormone (FSH) profile were similar between mares and women (Ginther et al 2005a), and on a comparative basis the incorporation of mares into this review is especially appropriate.…”