Refractoriness to melatonin and short daylengths in early seasonal quiescence in the Bennett's wallaby (Macropus rufogriseus rufogriseus)

Loudon, Andrew S. I.; Curlewis, J. D.

doi:10.1530/jrf.0.0810543

Cited by 13 publications

(5 citation statements)

References 23 publications

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“…The annual reproductive cycles of the tammar wallaby, Macropus eugenii, and Bennett's wallaby, Macropus rufogriseus rufogriseus, are characterized by two periods of quiescence, during which the corpus luteum (CL) is inhibited; in lactational quiescence the sucking stimulus of the pouch young maintains the inhibition, while in seasonal quiescence photoperiod is the proximate factor (Merchant & Calaby, 1981; Tyndale-Biscoe et al, 1986; Loudon & Curlewis, 1987; Tyndale-Biscoe & Renfree, 1987, for review). In the tammar, the pituitary tonically inhibits the CL because hypophysectomy during either period of quiescence induces reactivation of the CL (Hearn, 1974).…”

Section: Introductionmentioning

confidence: 99%

Morning pulse of prolactin maintains seasonal quiescence in the tammar, Macropus eugenii

Hinds

1989

Reproduction

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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 12L:12D. In Exp. 1A, in 5 of 6 control females the prolactin pulse was present until the 3rd morning after the lighting was changed, and absent thereafter. In both experiments the early progesterone peak and the interval to birth in the treated females was significantly delayed compared to the control females; reactivation of the CL did not occur until treatment ceased. In Exp. 2, for 5 consecutive mornings, before the prolactin pulse was expected to occur, bromocriptine was injected i.m. In 2/4 treated animals the prolactin pulse was abolished and these animals showed an early progesterone peak and gave birth 28 and 29 days after treatment began. The remaining 2 animals and the controls (N = 4) did not show reactivation until after they experienced a stimulatory photoperiod. The results indicate that the prolactin pulse is the critical factor in the maintenance of the inhibition of the CL of the tammar during seasonal quiescence.

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Section: Introductionmentioning

confidence: 99%

Morning pulse of prolactin maintains seasonal quiescence in the tammar, Macropus eugenii

Hinds

1989

Reproduction

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“…[26,68], wallabies Macropus spp. [61,52,45], the brush-tailed possum Trichosurus vulpecula [24] and the common bandicoot Isoodon macrourus [23]. The neuroendocrine control of reproduction in those mammals studied so far, including marsupials e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The neuroendocrine control of reproduction in those mammals studied so far, including marsupials e.g. [61,23,45,52,50], is initiated by the hormone melatonin, via the pineal gland, in response to photoperiod [62]. The neuroendocrine cascade results in gonadal and reproductive hormonal changes in response to these changes in photoperiod, and these have been best described in some hamsters and ground squirrels [27,11,2,30,31,66].…”

Section: Introductionmentioning

confidence: 99%

The influence of reproductive hormones on the torpor patterns of the marsupial Sminthopsis macroura: Bet-hedging in an unpredictable environment

McAllan

Feay

Bradley

et al. 2012

General and Comparative Endocrinology

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“…Most studies of seasonal breeding in marsupials have been carried out with two macropodid species: the tammar wallaby (Macropus eugenii) and Bennett's wallaby (Macropus rufogriseus). In these marsupials photoperiod is the major factor in the reactivation of the quiescent corpus luteum and the dormant blastocyst and in terminating seasonal quiescence (Loudon & Curlewis, 1987; Tyndale-Biscoe & Renfree, 1987 (Pilton & Sharman, 1962; Kerle, 1984;Sanderson & O'Driscoll, 1986). In other regions of Australasia, births are more seasonal (Kerle, 1984).…”

Section: Introductionmentioning

confidence: 99%

The role of photoperiod on the initiation of the breeding season of the brushtail possum (Trichosurus vulpecula)

Gemmell

Sernia²

1992

Reproduction

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Refractoriness to melatonin and short daylengths in early seasonal quiescence in the Bennett's wallaby (Macropus rufogriseus rufogriseus)

Cited by 13 publications

References 23 publications

Morning pulse of prolactin maintains seasonal quiescence in the tammar, Macropus eugenii

Morning pulse of prolactin maintains seasonal quiescence in the tammar, Macropus eugenii

The influence of reproductive hormones on the torpor patterns of the marsupial Sminthopsis macroura: Bet-hedging in an unpredictable environment

The role of photoperiod on the initiation of the breeding season of the brushtail possum (Trichosurus vulpecula)

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