changes in the concentration of inhibin , fsh , lh and testosterone were measured in the peripheral blood of adult soay rams during a reproductive cycle induced by exposure to an artificial lighting regimen ( long days with a 16-week period of short days ) or treatment with melatonin ( long days with a 12-week period when melatonin was administered daily in mid-light phase to simulate the effect of short days ) .
C0021463
inhibin
C0035150
reproductive