Abstract
Abstract The effects of various light intensity levels (0.11, 0.48, 0.96 and 1.86 mW/cm2) of constant white light on the testicular cycle of a wild bird, Black headed munia were investigated. While in higher intensity (0.96 and 1.86 mW/cm2) treated birds precocious gonadal development was observed, low intensity illumination prevented gonadal regression, indicating a better maintenance of testicular activity under low intensity lighting in Black headed munia. Since the total hours of light exposure (24 hr/day) were the same for all the four experimental groups, and higher intensities could not prevent gonadal regression, it would seem that light intensity is more important than the hours of illumination in the reproduction of this bird.
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