Intermediate-duration day lengths unmask reproductive responses to nonphotic environmental cues
نویسندگان
چکیده
منابع مشابه
Intermediate-duration day lengths unmask reproductive responses to nonphotic environmental cues.
Many animals time their breeding to the seasons, using the changing day length to forecast those months when environmental conditions favor reproductive success; in Siberian hamsters (Phodopus sungorus), long summer days stimulate, whereas short winter days inhibit, reproductive physiology and behavior. Nonphotic environmental cues are also thought to influence the timing of breeding, but typic...
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Perihypothalamic thyroid hormone signaling features prominently in the seasonal control of reproductive physiology. Triiodothyronine (T(3)) signaling stimulates gonadal development, and decrements in T(3) signaling are associated with gonadal regression. Type 3 iodothyronine deiodinase (DIO3) converts the prohormone thyroxine (T(4)) into biologically inactive 3,3',5'-triiodothyronine, and in lo...
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 کاملSustained melatonin treatment blocks body mass, pelage, reproductive, and fever responses to short day lengths in female Siberian hamsters.
Winter imposes physiological challenges on individuals including increased thermoregulatory demands, risk of infection, and decreased food availability. To survive these challenges, animals living outside the tropics must appropriately distribute their energetic costs across the year, including reproduction and immune function. Individuals of many species use the annual cycle of changing day le...
متن کاملExposure duration to long day lengths associated with the expression of photorefractoriness in turkey breeder hens.
In addition to inducing egg production, exposure to long days concomitantly activates processes that eventually result in photorefractoriness (PR) and cessation of egg production. Experiments were conducted to evaluate the duration of exposure to long days that result in these processes. In each of 3 experiments, we subjected Large White turkey breeder hens to long days (16 or 18 h per day) for...
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ژورنال
عنوان ژورنال: American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
سال: 2009
ISSN: 0363-6119,1522-1490
DOI: 10.1152/ajpregu.91047.2008