中鎖脂肪給与が子牛の飼料消化性,第一胃内発酵および血液成分に及ぼす影響

概要

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The effects of medium chain triglycerides (MCT) on rumen fermentation, feed digestion and blood properties were studied. Two experimental diets containing tricaprylin (C8) or tricaprin (C10), and a control diet were given to young calves. In the C10 feeding, ruminal volatile fatty acid (VFA) levels increased more slowly after the feeding, the molar proportion of propionic acid decreased, and that of butyric acid increased markedly. Ruminal ammonia-N levels were lower in the MCT feeding, especially in the C10 feeding. Approximately equal amounts of dietary energy were given in all calves during the 14 weeks feeding trials, though live weight gains were higher in calves given the C10 diet. Apparent digestibilities of fiber (ADF and NDF) were somewhat lower in the MCT feeding. Between the control and C8 groups, little differences were observed in plasma total cholesterol and phospholipid levels. In the C10 feeding, however, plasma concentrations of total cholesterol and phospholipid levels increased remarkably. Plasma Ca, Mg and Pi levels were hardly influenced by the MCT feeding. Plasma insulin level was lower in the calves given the C8 and C10 diets, though concentrations of glucose, non-esterified fatty acid, triglyceride, urea, lactic acid, acetic acid and 3-hydroxybutyric acid were scarcely affected by the MCT feeding.
社団法人日本畜産学会の論文