第一胃内揮発性脂肪酸の生成におよぼす各種飼料の影響

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Determinations of volatile fatty acid, pH, and nitrogen constituents were made of the rumen fluid of sheep before and two hours after feeding. About 500g per head of corn meal, rice bran, soybean oil meal, or a ration consisting of corn and soybean oil meal were administered into the rumen through a rumen fistula continually every day for several days. Only wheat bran or corn meal was consumed voluntarily by the animals.In other experiments, Ladino clover was given animals for two hours either as cut herbage or by grazing on pasture in various seasons.The level of volatile fatty acid was the highest when the animals grazed on a Ladinoclover pasture in early spring. It was in a range of 14.2 to 19.7mM/dl, 16mM/dl on the average. The ration, consisting of corn and soybean oil meal, which was used as bloatproducing diet by SMITH et al., also brought about a high fatty acid level, the mean of the level being 14.6mM/dl. However, the consumption of corn meal, soybean oil meal, wheat bran, or rice bran was in a range of 8 to 12mM/dl.The increase of rumen volatile fatty acid seemed to be associated with the fall of the pH, as well as the increase of non-protein nitrogen, of the rumen fluid when the animal was grazed on Ladino clover. On the other hand, most of the concentrates caused markedly a low pH of the rumen fluid.
社団法人日本畜産学会の論文