Effect of Diets on the Number of Protozoa in the Rumen, with Special Reference to the Effect of Purified Diets and Sterol in Diets

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  • HIND Tsuneo
    Laboratory of Nutritional Chemistry and Animal Nutrition, Faculty of Agriculture, University of Tokyo
  • KAMETAKA Masao
    Laboratory of Nutritional Chemistry and Animal Nutrition, Faculty of Agriculture, University of Tokyo

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Other Title
  • ルーメン内のプロトゾア数に及ぼす飼料,特に精製飼料とステロールの影響
  • ルーメン ナイ ノ プロトゾアスウ ニ オヨボス シリョウ , トクニ セイセイ シリョウ ト ステロール ノ エイキョウ

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Effect of dietary sterol on the number of protozoa in the rumen was studied by offering goats defatted alfalfa-hay diets or purified diets with and without β-sitosterol. When animals were fed diets without β-sitosterol, gradual decrease in the number of protozoa was observed, followed by clear increase by feeding diets supplemented with the sterol. However, even when a diet containing an extremely small quantity of sterol was given for 28 days, protozoa maintained their number above 104 per ml throughout the experimental period. Attempts were made to prepare purified diets allowing the regular growth of protozoa in the rumen, and it was found that not only chemical composition but also physical form of diets is important for the maintenance of protozoa. A purified diet in the form of lumps permitted the maintenance of protozoa at high population densities(5-10×105/ml). The diet was prepared as follows:After arnylopectin particles, to which casein, gelatin, vitamins, minerals, and β-sitosterol had been adsorbed, were. coated with a synthetic polymer, the particles were mixed with wood pulp and polyvinyl fiber, and then the mixture was pelleted as irregular small lumps. A purified diet containing non-protein nitrogen(urea and ammonium sulfate) as the sole source of nitrogen also permitted the maintenance of protozoa at normal population densities (above 105/ml).

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