九州大学農学部生物資源環境学科動物生産科学コース畜産学分野家畜飼料生産利用学研究室
Program of Animal Science, Course of Animal and Marin Bioresource Science, Department of Bioresource and Bioenvironment, School of Agriculture, Kyushu University
九州大学農学部生物資源環境学科動物生産科学コース畜産学分野家畜飼料生産利用学研究室
Program of Animal Science, Course of Animal and Marin Bioresource Science, Department of Bioresource and Bioenvironment, School of Agriculture, Kyushu University
九州大学大学院農学研究院動物資源科学部門家畜生産学講座家畜飼料生産利用学研究室
Laboratory of Feed Science, Division of Animal Science, Department of Animal and Marine Bioresource Science, Faculty of Agriculture, Kyushu University
We investigated the antibiotic action of ethanol in the improvement of the fermentation quality of guineagrass (Panicurn maximum Jacq. var. Natsukaze) silage. Two experiments were conducted to examine the effects of quantity of ethanol on silage quality (experiment 1) and on fermentation process (experiment 2). Guineagrass was cut at heading stage in the regrowth and as much as 550 grams of the material treated with ethanol were ensiled into a laboratory silo (1.0 liter polyethylene container). ln experiment 1, ethanol was added at O, O.5, 1, 3 or 5% on the fresh weight basis of the material, followed by storing for 36 days. ln experiment 2, ethanol was added at O, 1 or 5% on the fresh weight basis of the material, followed by storing for 1, 3, 7, 14 or 36 days. After the silos were opened, samples were analyzed for pH, dry matter (DM), total nitrogen (TN), volatile basic pitrogen (VBN), organic acids, mono- and oligo- saccharide, starch and in vitro dry matter digestibility (IVDMD). The material was also subjected to proximal analysis. The following results were obtained. Compared with the other treatments with lower concentration, 50/o addition of ethanol significantly decreased pH value, VBN/TN, contents of butyric and acetic acids, and significantly increased lactic acid content and there were increases in mono- and oligo-saccharide, IVDMD and V-Score after 36 days of fermentation. ln particular, the production of lactic acid was increased greatly after 7 days and there was a high production after 14 days. lt was suggested in guineagrass silages that ethanol addition depressed the activities of microorganisms producing acetic and butyric acids and increased the activity of lactic acid bacteria (LAB) by saving substrates for their use by LAB, which was kept after 7 days to make silages of good quality.