Effect of Pelleting Conditions of Rapeseed Meal Diet on Thyroid Size of Chicks

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  • ナタネかす飼料のペレット製造条件がひなの甲状せん重量に及ぼす影響

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Two experiments were conducted to determine the effect of pelleting conditions of rapeseed meal diet on 5-vinyl-2-oxazolidinethione (OZT) content and thyroid weight of chicks.<br>Male White Leghorn chicks were fed rapeseed meal diets containing 20% rapeseed meal or a soybean meal control diet. Rapeseed meal diets were offered as non-treated mash, non-steam pelleted and reground mash, steam pelleted (75°C) and reground mash or steam pelleted (90°C) and reground mash.<br>Thyroid weight of chicks fed rapeseed meal diets increased about two times as large as that fed the soybean meal control diet. Steam pelleting of the rapeseed meal diet decreased 4-6% of OZT content in the diet, but had no significant effect on thyroid weight of chicks. Non-steam pelleting of the rapeseed meal diet had no effect on both OZT content in the diet and thyroid weight of chicks.

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