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INFLUENCE OF DECREASED LENGTH OF DIFFERENT SPECTRAL PHOTOPERIODS ON TESTIS DEVELOPMENT OF DOMESTIC FOWL

Summary.: White Leghorn cockerels between 14 and 18 weeks of age were subjected to a decrease in hours of clear, red, blue and green photoperiods. The decrease in photoperiod length of clear and red light inhibited testis development and spermatogenesis. The decrease in photoperiod length in blue and green light failed to show the inhibitory effect. Pituitary gonadotrophin activity indicated that both production and release of gonadotrophins were inhibited by decreased hours of clear and red light.