乳牛の肝臓の脂肪酸組成とトリグリセリド量の関係 Fatty Acid Profiles in Relation to Triglyceride Level in the Liver of Dairy Cows

健康な乳牛6頭および患畜17頭を用い肝臓の脂肪酸組成とトリグリセリド(TG)量を調べた。健康牛の肝臓TGは0.1-0.3%(新鮮重当り)であったが,患畜のうち12頭のTGは3%以上で脂肪肝とした。脂肪肝牛では肝臓のパルミチン酸とオレイン酸割合が有意に高く,ステアリン酸割合が有意に低かった。TG量が増加するにつれステアリン酸割合が劇的に低下した。肝臓の脂肪化によって脂肪酸組成にも変化があるといえる。

To elucidate possible relationships between triglyceride (TG) levels and fatty acid composition in bovine liver, hepatic TG and seven individual fatty acids were measured in 23 Holstein dairy cows, of them 6 are healthy. Liver TG level was greater than 3 % in 12 cows which were ruled fatty liver. Palmitic and oleic acid proportions were significantly higher in fatty liver cows than in the healthy cows, while stearic acid was lower in fatty liver cows. With increased liver TG, stearic acid proportions decreased dramatically. Results indicate that hepatic lipidosis markedly alters the proportions of the various fatty acids in the liver of dairy cows.