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- W1964165380 abstract "A study of the effects of melatonin injections given to male Syrian hamsters (Mesocricetus auratus) late in the light phase in a 14L:10D photoperiod included control, oil-injected hamsters that had been transferred from a 16L:8D photoperiod. Many oil-injected hamsters underwent gonadal regression under these conditions. A literature review indicated that endocrine effects of 'control' injections are fairly common but that they might depend on previous photoperiodic history. A second study found that hamsters born and raised in 16L:8D had larger testes at 150 days of age than those raised in 14L:10D. Transfer from 16L:8D to 14L:10D caused some unhandled hamsters to show gonadal regression while transfer to 14L:10D combined with daily oil injections caused most hamsters to undergo gonadal regression. Injections in animals maintained in 14L:10D throughout the study did not cause gonadal regression. These results indicate that stress effects can confound interpretation of drug treatments that require daily injections. They also demonstrate that the endocrine system of male Syrian hamsters distinguishes two photoperiods that are longer than the critical daylength (12.5 h). The effects of shortening daylengths may be potentiated by environmental stressors; together these may trigger gonadal regression at variable annual phases in anticipation of the critical daylength." @default.
- W1964165380 created "2016-06-24" @default.
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- W1964165380 date "1988-01-01" @default.
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- W1964165380 title "Interactive Effects of Stress and Photoperiod History on Gonadal Condition in Male Syrian Hamsters" @default.
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- W1964165380 doi "https://doi.org/10.1111/j.1600-079x.1988.tb00767.x" @default.
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