Endocrine correlates of hibernation-independent gonadal recrudescence and the limited late-winter breeding season in woodchucks, Marmota monax.

Endocrine correlates of hibernation-independent gonadal recrudescence and the limited late-winter breeding season in woodchucks, Marmota monax.
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土拨鼠冬眠独立的性腺复发和有限的冬末繁殖季节的内分泌相关性。

DOI:
10.1002/jez.1402560444
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发表时间:
1990
期刊:
The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry
影响因子:
--
通讯作者:
Tennant,B
Tennant,B
中科院分区:
--
文献类型:
--
作者:
Concannon,PW;Baldwin,B;Roberts,P;Tennant,B

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旱獭(旱獭)通常在4-5个月的冬眠结束时经历性腺再生,在冬末出现,在短短3周的繁殖季节立即繁殖,并在下一次冬眠之前恢复性腺。我们对野生动物和圈养动物的研究表明,有生育能力的雌性动物在妊娠32天后产下单胎,它们的繁殖季节在产后1-3个月的妊娠黄体重新激活后终止。在未繁殖的雌性中,繁殖季节同样在春分后不久因卵巢自发黄体化而终止1-3个月。在繁殖季节和之后,睾丸退化和睾丸素下降。在没有冬眠的情况下,一年一次的繁殖周期持续存在,在3-5年的12L:12D光周期后缩短到9-10个月。该物种值得内分泌研究的独特方面包括睾丸的年度下降/收缩,分娩时短暂的黄体溶解,产后黄体的过度激活,每年内源性代谢周期对垂体-性腺轴的调节与每年光周期的变化有关,以及冬眠的激素基础。
Woodchucks (Marmota monax) normally experience gonadal recrudescence towards the end of a 4–5 month hibernation, emerge in late winter, immediately breed in a short 3‐week breeding season, and have regressed gonads before the next hibernation. Our studies of wild and captive animals show that fertile females give birth to single litters after a 32‐day gestation and their breeding season is terminated by a reactivation of the corpora lutea of pregnancy for 1–3 months immediately postpartum. In nonbred females the breeding season is likewise terminated by spontaneous luteinization of the ovaries for 1–3 months shortly after the vernal equinox. Testes regress and testosterone declines during and after the breeding season. Circannual reproductive cycles persist in the absence of hibernation and are shortened to 9–10 months after 3–5 years of a 12L:12D photoperiod. Unique aspects of this species that merit endocrine investigation include annual descent/retraction of testes, transient luteolysis at parturition, superactivatior of postpartum corpora lutea, regulation of the pituitary‐gonadal axis by an annual endogenous metabolic cycle entrained to the annual change in photoperiod, and the hormonal basis of hibernation.
土拨鼠(Marmota monax)食物消耗的季节性变化。
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影响因子: 1.7
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红土旱獭 Marmota monax rufescens Howell 的生活史
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发表时间: 1934
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期刊: Physiological Zoology
影响因子: --
作者:
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