ニワトリ腎臓Ornithine Transcarbamylaseの誘導-1-卵黄中の粗脂肪成分がOTC活性に及ぼす影響〔英文〕

概要

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Feeding an egg yolk diet to variant chicks possessing Ob c gene increases ornithine transcarbamylase [EC 2. 1. 3. 3] (OTC) activity in their kid-nays. In the present study, experiments were carried out to reveal what components of the yolk have an inducing effect on OTC activity. As egg yolk has a high fat content, the effect of fat in the diet on OTC activity was examined. In the experimental diets, the fat fraction of egg yolk was replaced with acetone extracted yolk fat, chicken fat, or corn oil. Feeding diets consisting of acetone extracted yolk fat or corn oil affected OTC induction. Ornithine transcarbamylase activity increased with an increasing corn oil content in the diet, suggesting that a high fat content in the diet, such as in yolk, is a cause of OTC induction. These results suggested that yolk fat contains no special materials that induce chick OTC. When yolk fat was replaced with chicken fat, OTC was induced to a lesser extent. Therefore, it seems likely that fat has an important role in OTC induction not only in quantity, but also in quality. In the latter case, different digestibility of fat may affect the result. The finding that feeding a high fat diet increases OTC activity marks a notable distinction between chick OTC and mammalian OTC.
社団法人日本畜産学会の論文