低ヨウ素飼料を摂取した雛の甲状腺機能に対する粗キチン給与の影響

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  • Effect of Dietary Crude Chitin on Thyroid Function in Chicks Fed a Low Iodine Diet.
  • Effect of Dietary Crude Chitin on Thyro

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Two experiments were conducted with 1-day-old chicks to determine the effect of dietary crude chitin processed industrially from marine crab shell waste on thyroid function in chicks fed a low iodine diet. In Experiment 1, chicks were assigned to four different dietary treatment-groups and fed on each diet for 3 weeks. All diets were formulated by supplementing 5% crude chitin and/or 0.5mg/kg KI to the low iodine basal diet. Dietary treatments in Experiment 2 were similar to those in Experiment 1 except that the low iodine basal diet was supplemented with 0.03% thiouracil (TU). In Experiment 1, the dietary crude chitin or KI ameliorated the decrease in plasma thyroxine concentration, the enlargement of the thyroid gland and the excessive abdominal fat deposition induced by the low iodine basal diet, but crude chitin had no additional effect on these parameters in chicks fed the KI-added diet. In Experiment 2, the dietary crude chitin or KI improved the growth retardation and excessive abdominal fat deposition induced by the low iodine basal diet containing 0.03% TU, but there were no significant differences in the growth and abdominal fat weight among dietary crude chitin, KI and crude chitin+KI treatments. These results suggested that dietary crude chitin improved a low thyroid function induced by the low iodine diet with or without TU in chicks.

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