Photoperiod and testicular function in Phodopus sungorus.
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منابع مشابه
Photoperiod affects neuronal nitric oxide synthase and aggressive behaviour in male Siberian hamsters (Phodopus sungorus).
Many nontropical animals display physiological and behavioural changes in response to seasonal environmental cues including photoperiod (day length). Male Siberian hamsters (Phodopus sungorus) housed in short photoperiod undergo testicular regression accompanied by reduced circulating testosterone and decreased reproductive behaviour. By contrast to the majority of small mammals studied, aggres...
متن کاملEffects of photoperiod history on immune responses to intermediate day lengths in Siberian hamsters (Phodopus sungorus).
Seasonal changes in day length enhance or suppress immune function in individuals of several mammalian species. Siberian hamsters (Phodopus sungorus) are long-day breeders that adjust reproductive physiology and behavior, body mass, and immune function following exposure to short photoperiods. Photoperiods of intermediate-duration, encountered in nature by juvenile hamsters born in early-spring...
متن کاملExogenous kisspeptin does not alter photoperiod-induced gonadal regression in Siberian hamsters (Phodopus sungorus).
In order to reproduce successfully, animals must integrate multiple environmental cues to synchronize breeding with favorable conditions. In temperate, seasonally breeding rodents, photoperiod acts as the primary seasonal cue. Long days are associated with reproductive development and maturation of the gonads whereas short days induce gonadal regression. The neuropeptide kisspeptin has potent s...
متن کاملSeasonal plasticity of neuromuscular junctions in adult male Siberian hamsters (Phodopus sungorus).
Transfer of adult Siberian hamsters, Phodopus sungorus, from long day (16 h light and 8 h dark; 16L:8D) to short day (8L:16D) photoperiods induces an involution of the gonads and a cessation of reproductive behavior 8-10 weeks later. The motoneurons of the spinal nucleus of the bulbocavernosus and their target muscles, the bulbocavernosus and the levator ani, are sexually dimorphic and are nece...
متن کاملPhotoperiod modulates gut bacteria composition in male Siberian hamsters (Phodopus sungorus).
Seasonal changes in day length (i.e., photoperiod) provide animals with a reliable environmental cue to determine time of year, and many physiological changes occur in laboratory animals simply by extending or shortening day length. Male Siberian hamsters (Phodopus sungorus) housed in long summer-like day lengths have significantly elevated body and fat masses compared to short-day hamsters. Be...
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ورودعنوان ژورنال:
- Advances in anatomy, embryology, and cell biology
دوره 105 شماره
صفحات -
تاریخ انتشار 1987