title: Effects of daily melatonin injections on the photoperiodic gonadal response of the female frog Rana ridibunda.
abstract: The effects of daily melatonin injections on female gonads in Rana ridibunda were examined. Melatonin-treated R. ridibunda maintained on a long photoperiod (18L:6D) had significantly smaller gonads than control animals. Thus, frogs injected daily with melatonin exhibited a substantial decrease in ovary weight when compared to saline-injected animals. Our findings suggest that melatonin exerts antigonadal effects in female Rana ridibunda.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm / Q000187:drug effects*; D005260:Female; D008550:Melatonin / Q000494:pharmacology*; D010053:Ovary / Q000502:physiology*; D011895:Rana ridibunda / Q000502:physiology*; D011898:Ranidae / Q000502:physiology*
chemical_list: D008550:Melatonin