Words similar to nonreproductive
Example sentences for: nonreproductive
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Previous studies on rats have shown that adults of some strains can be made reproductively responsive to SD by manipulations such as androgen treatment [ 8 9 ] , olfactory bulbectomy [ 21 22 ] (but see [ 23 ] ), or food restriction [ 7 ] . An effect of short photoperiod on body weight of unmanipulated adult rats has not been reported previously, but has been reported for unmanipulated young rats of several strains (Zucker rats [ 24 ] , F344 rats [ 5 15 ] , Wistar rats [ 25 ] , and BN rats [ 6 ] ). To our knowledge, this study is the first report of reproductive and nonreproductive responses to short photoperiod in adult, unmanipulated rats.
Here we report that adult F344 rats retain both reproductive and nonreproductive responses to short photoperiod, and that there is weak evidence for an endogenous circannual rhythm of reproductive responses to short photoperiod in F344 rats, but not such a rhythm for non-reproductive responses to short photoperiod.
A previous study on Siberian hamsters [ 30 ] reported a similar dissociation between endogenous timing of reproductive and nonreproductive responses to constant short photoperiod similar to the results in experiment 2. Siberian hamsters in constant short days, but not long days, underwent two cycles of a seasonal rhythm in testis size, but reproductive changes in the second cycle were not accompanied by a typical winter molt, and there was inconclusive evidence for a body weight rhythm [ 30 ] . However, the results of experiment 2 were not consistent between SD and INT treatments.
These results have implications for studies on F344 and other photoperiodic strains of rats, particularly because the F344 rat is widely studied throughout the world, and has been the most commonly used inbred rat strain in the United States [ 32 ] . The existence of both reproductive and nonreproductive responses of adult F344 rats to short photoperiod, and the possibility for weak endogenous circannual responses to short photoperiods could complicate the design and interpretation of experimental results, especially in the case of long-term studies.
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