Words similar to photoperiod
Example sentences for: photoperiod
How can you use “photoperiod” in a sentence? Here are some example sentences to help you improve your vocabulary:
There was a significant interaction between measurement week and photoperiod treatment (P < 0.0001, F = 35.
Sixty grams is confirmed as a critical body mass for induction of estrus in juvenile female opossums as identified in our previous study [ 7 ] . Somatic growth and attainment of a threshold body mass or energy reserves are known requisites for puberty in many mammals including the tammar wallaby [ 26 ] , sheep [ 27 28 ] , and several species of rodents [ 1 ] , but these factors seldom act independently of environmental factors such as photoperiod [ 26 27 ] or social cues [ 3 29 ] . The opossum is unusual in this regard, because social cues in the form of male pheromone appear to stimulate both somatic growth and ovarian activation.
However, recent work shows that laboratory rat strains vary in their responsiveness to photoperiod [ 3 4 5 6 ] . Laboratory rats of some strains can be manipulated to unmask responses to photoperiod or melatonin, even though short photoperiod alone does not affect reproduction [ 7 8 9 ] . Peripubertal rats in the inbred Fischer 344 (F344) and Brown Norway (BN) strains are naturally sensitive to reproductive inhibition by short photoperiod alone [ 4 5 6 ] . In several species of rodents, peripubertal young have stronger reproductive responses to photoperiod than adults [ 10 11 12 13 ] , and this appears to be true for induced-photoresponsive laboratory rats as well [ 14 ] .
5 h photoperiod.
Without the LD group as a control, this kind of change attributable to an uncontrolled variable would have been impossible to distinguish from the effect of an endogenous timer controlling the response to photoperiod.
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