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- W84168538 abstract "The aim of this study was to investigate the secretion patterns of FSH: (i) during the canine oestrous cycle with particular attention to the luteal period; and (ii) during 24 h in male and female dogs. Plasma FSH concentrations were measured by a highly specific homologous canine immunoradiometrical (IRMA) assay using monoclonal antibodies specific for canine FSH. In the first study, FSH concentrations were measured daily from +/- 15 days before until 150 days after the LH surge in groups of pregnant (n = 5) and nonpregnant (n = 5) Beagle bitches. Day 0 of the cycle was the day of the preovulatory LH peak as measured by LH radioimmunoassay. In the second study, FSH concentrations were measured at 1 h intervals for 24 h in five bitches at day 120 after the LH surge and in five males. From day 35 to day 40 after the LH peak, FSH concentrations were higher in pregnant than in nonpregnant luteal phases. A significant and abrupt decrease in FSH concentrations was observed at about the time of parturition (day 65) and was followed by lower FSH concentrations during lactation compared with nonpregnant bitches. FSH concentrations in nonpregnant animals were fairly constant from the end of oestrus to mid-anoestrus. In both post-lactation and anoestrous bitches, plasma concentrations of FSH increased consistently as anoestrus progressed. No significant differences in the mean hour-to-hour patterns of FSH secretion were observed over 24 h and no differences were detected between male and female dogs. However, a clear pulsatile pattern of secretion was observed in all individuals, both males and females, with an apparent 4.8 h interval between peaks. The results of this study demonstrate major differences in FSH secretion between pregnant and nonpregnant bitches. This finding indicates that there are differences in the regulation of the hypothalamo-pituitary-ovarian axis during pregnancy, possibly related to changes in activity of the corpus luteum. The results of this study also demonstrate a pulsatile pattern of FSH secretion in both male and female bitches, with a 4.8 h interval between peaks, and confirms the progressive increase in plasma FSH concentrations observed during anoestrus." @default.
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- W84168538 date "2001-01-01" @default.
- W84168538 modified "2023-09-26" @default.
- W84168538 title "FSH secretion patterns during pregnant and nonpregnant luteal periods and 24 h secretion patterns in male and female dogs." @default.
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