1989
DOI: 10.1530/jrf.0.0870735
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Morning pulse of prolactin maintains seasonal quiescence in the tammar, Macropus eugenii

Abstract: The pulse of prolactin, present in female tammars kept in an inhibitory photoperiod and absent 5 days after a change to a stimulatory photoperiod, was artificially maintained during stimulatory photoperiods (Exps 1A and 1B) or abolished during an inhibitory photoperiod (Exp. 2). In Exp. 1A, thyrotrophin-releasing hormone (TRH) was injected i.v. for 8 consecutive mornings and in Exp. 1B ovine prolactin was injected i.v. for 10 consecutive mornings beginning on the day the photoperiod was changed from 15L:9D to … Show more

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Cited by 26 publications
(24 citation statements)
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“…The amplitude of the prolactin peak at the end of the cycle was similar to the daily pulse of prolactin that has been shown to inhibit the development of the quiescent CL during seasonal quiescence (Hinds, 1989) but the duration of the peripartum peak is longer. Prolactin therefore appears to have several roles in the control of luteal cell function; at the beginning it blocks the developmental pathway leading to hypertrophy and hyperplasia, while at the end it is first luteotrophic and then luteolytic.…”
Section: Discussionsupporting
confidence: 56%
See 1 more Smart Citation
“…The amplitude of the prolactin peak at the end of the cycle was similar to the daily pulse of prolactin that has been shown to inhibit the development of the quiescent CL during seasonal quiescence (Hinds, 1989) but the duration of the peripartum peak is longer. Prolactin therefore appears to have several roles in the control of luteal cell function; at the beginning it blocks the developmental pathway leading to hypertrophy and hyperplasia, while at the end it is first luteotrophic and then luteolytic.…”
Section: Discussionsupporting
confidence: 56%
“…The present study was designed to address three questions that arose from these previous studies: (1) to resolve the respective roles of prolactin and PG in luteolysis; (2) (Hinds. 1989 Fig.…”
Section: Introductionmentioning
confidence: 99%
“…Luteal cells have a high concentration of prolactin receptors (Sernia and Tyndale-Biscoe, 1979). Prolactin suppresses activity of the corpus luteum and so prevents secretion of progesterone (Hearn, 1973, Hinds, 1989, Hinds and Tyndale-Biscoe, 1982, Sernia and Tyndale-Biscoe, 1979. Thus prolactin is luteostatic in the tammar, in contrast to the luteotrophic actions of prolactin in other mammalian species, and the absence of a hormonal signal (progesterone) from the quiescent corpus luteum maintains diapause.…”
Section: Entry Into and Maintenance Of Diapausementioning
confidence: 99%
“…In this study, adult females with a pouch young older than day 8 post-partum were presumed to be carrying a diapausing blastocyst (Tyndale-Biscoe & Renfree 1987). Before reactivation from diapause can occur, the pouch younginduced luteal inhibition must be removed for 3 consecutive days (Gordon et al 1988, Hinds 1989. Therefore, after diapause the reactivation stages of pregnancy were determined relative to the day of RPY (day 0; Fig.…”
Section: Blastocystmentioning
confidence: 99%