Factors Affecting Digestibility and Voluntary Intake of Roughages in Ruminants:1. Interrelations among Particle Size, Digestibility and Voluntry Intake of Italian Ryegrass Hay in Goats

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1. Five experiments were conducted with goats to examine the influence of fineness of ground Italian Ryegrass hay on its digestibility and voluntary intake. In experiment 1, 2, 3 and 4, goats were fed ad tibitum with long hay, coarsely ground hay (4 mm screen), medium ground hay (2 mm screen) and finely ground hay (1 mm screen), respectively, and in experiment 5, were restricted to about one-half of hay intake in experiment 1.<BR>2. The daily mean voluntary intakes were not significantly different among long hay (except in experiment 5) and ground hays, but tended to be depressed slightly with increasing the fineness of ground hay.<BR>3. The digestibilities of crude protein (CP), ether extract (EE) and nitrogen free extract (NFE) were not correlated to the fineness of ground of hay, but were correlated to their respective contents of rations.<BR>4. The digestibility of crude fiber (CF) was correlated negatively to the fineness of particle size of feses, but was not correlated to dry matter (DM) intake, content of acid detergent lignin (ADL) and fineness of ground of hay.<BR>5. It was suggested that the digestion of CP, EE and NFE were related to their respective contents of rations, and the digestion of CF was related to the fineness of particle size of digesta.
日本暖地畜産学会の論文