Influence of high vitamin E dosages on retinol and carotinoid concentration in body tissues and eggs of laying hens

A. Sünder, G. Flachowsky
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引用次数: 30

Abstract

The aim of the study was to contribute to the discussion of overdosing vitamin E in laying hens. A total of 45 laying hens, divided into 5 groups were fed diets supplemented with either 0; 100; 1000; 10 000 or 20 000 mg dl‐α‐tocopheryl acetate/kg diet over a period of 10 weeks. Concentrations of vitamins A and E were measured in plasma, various tissues and egg yolk. Furthermore egg yolk colour and some carotinoids were measured in egg yolks. None of the vitamin E doses significantly influenced performance of the hens. As expected, vitamin E concentration in plasma, all tissue samples and egg yolk was significantly increased with increasing tocopherol content in the diet. The egg yolk showed the highest vitamin E concentration, followed by liver and muscles. Feeding 1000 mg α‐tocopheryl acetate per kg diet resulted in an increase of vitamin A concentration in the liver. Very high doses (10 000 and 20 000 mg/kg diet) significantly decreased retinol concentration in the liver and egg yolk, as well as carotinoid concentration in the egg yolk. The lower carotinoid concentration in egg yolk resulted in a decreased intensity of egg yolk colour. A prooxidative and/or competitive effect of very high doses of vitamin E with other fat soluble substances has been discussed.
高剂量维生素E对蛋鸡身体组织和鸡蛋中视黄醇和类胡萝卜素浓度的影响
本研究旨在探讨蛋鸡维生素E过量的问题。选取45只蛋鸡,随机分为5组,分别饲喂饲粮中添加0;100;1000;在10周的时间内,每公斤饲料中添加10000或20000 mg dl - α -生育酚醋酸酯。测定血浆、各组织和蛋黄中维生素A和E的浓度。此外,还测定了蛋黄颜色和一些类胡萝卜素。各剂量维生素E对母鸡生产性能均无显著影响。正如预期的那样,随着日粮中生育酚含量的增加,血浆、所有组织样品和蛋黄中维生素E浓度显著升高。蛋黄的维生素E含量最高,其次是肝脏和肌肉。饲喂每公斤饲料1000 mg α‐生育酚乙酸导致肝脏中维生素A浓度升高。高剂量(10 000和20 000 mg/kg日粮)显著降低了肝脏和蛋黄中的视黄醇浓度以及蛋黄中的类胡萝卜素浓度。蛋黄中类胡萝卜素浓度降低导致蛋黄颜色强度降低。高剂量维生素E与其他脂溶性物质的促氧化和/或竞争作用已被讨论。
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