Effect of Photoperiod and Castration on the Diurnal Rhythm in the Pituitary Gonadotropic Activity of Male Japanese Quail

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  • HASHIGUCHI Mineo
    HIYAMA Laboratory of Animal Breeding, Faculty of Agriculture, Kyushu University
  • KOGA Osamu
    HIYAMA Laboratory of Animal Breeding, Faculty of Agriculture, Kyushu University
  • NISHIYAMA Hisayoshi
    HIYAMA Laboratory of Animal Breeding, Faculty of Agriculture, Kyushu University

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Other Title
  • 雄ウズラの下垂体前葉の性腺刺激ホルモン力価の日内変動に及ぼす光周期と精巣除去の影響
  • ユウ ウズラ ノ カスイタイ ゼンヨウ ノ セイセン シゲキ ホルモン リキカ

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Abstract

Using a bioassay based on 32P-uptake by chick testes, the gonadotropic activity of anterior lobes of pituitary at various times during a 24-hr period was determined for intact male quail which were kept under 8L:16D (8 hours light and 16 hours darkness) for 5 weeks from 29 days of age and for intact and castrated quail which were kept under 8L:16D for 3 weeks from 29 days of age and thereafter under 14L:10D for 2 weeks. In intact birds kept under 8L:16D, no appreciable diurnal rhythm in the pituitary gonadotropic activity was observed. In intact birds kept under 14L:10D, the activity showed two peaks at 8:00 (3 hr after the onset of light) and 19:00 (the end of light period). However, only one peak was found at 19:00 in castrated birds kept under 14L:10D. The results indicate that the diurnal rhythm in the pituitary gonadotropic activity of male quail during the abrupt testicular growth may appear in relation to photoperiod and testicular function.

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