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      Pinealectomy and Light Environment Effects on Testicular and Comb Development in the 46-Day-Old Broiler Cockerel

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      Poultry Science

      Oxford University Press (OUP)

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          Abstract

          Four replicate experiments were conducted to determine the effects of pinealectomy and environmental lighting on testes and comb weights in the broiler cockerel. Birds were housed in brooder batteries under a 14L:10D fluorescent white light regime for 2 weeks and then allotted to light-controlled chambers. Surgery was performed when the chicks were 3 to 5 days old. The fluorescent light treatments were 14L:10D green (narrow-band, 545 nm peak), 14L:10D cool white, and constant darkness. At the end of the 46-day experimental period, testes weights were determined and comb weight recorded. Pinealectomy did not affect testes weights or comb development. Darkness significantly (P less than .05) depressed testes and comb weight. This suggests that lack of light, but not pinealectomy, affects circulating hormone levels and/or tissue responsiveness in the young cockerel.

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          Author and article information

          Journal
          Poultry Science
          Poultry Science
          Oxford University Press (OUP)
          00325791
          April 1980
          April 1980
          : 59
          : 4
          : 918-920
          Article
          10.3382/ps.0590918
          7375438
          © 1980

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