Morphometrical studies of reproductive system of birds after treatment with dopamine receptor blockers and melatonin.

Male Japanese quails were treated with melatonin alone or melatonin combined with D1 and D2 dopamine receptor blockers. Following the treatment, hypothalamus, pituitary glands and testes were analyzed morphometrically. The results suggest the existence of an interaction between melatonin and dopaminergic system in the brain in the regulation of reproductive processes in immature birds. The character of this interaction alters according to the time of the treatment (morning, afternoon, evening, night).