Studies on rice straw silage - effects on moisture content of rice straw on fermentative quality and intake of silage by dairy heifer

Manda, T.; Izumi, H.; Takano, N.

Bulletin of the National Grassland Research Institute 9: 16-24


Accession: 000511474

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With decreasing moisture content of rice straw, the production of organic acids and the ratio of volatile basic N to total N in silage declined gradually, while pH of silage rose. By addition of water at ensiling to low-moisture rice straw, the fermentative rate of silage was promoted significantly. The contents of water-soluble carbohydrate of low-moisture silages were larger than those of high-moisture or water-added silages because of the better fermentative rates of the latter silages. When fresh rice straw of 65% moisture content was ensiled in a vinyl bag silo without compaction, removal of air and weighting, oxygen gas concentration in the silo decreased to 0.9%, 8.5 h after ensiling. No significant difference in DM intake by dairy heifers was found between silages prepared from rice straws of different moisture contents adjusted by drying or addition of water.From the results on fermentative rate and DM intake of silages by heifers, moisture contents of 50 to 65% and 45 to 75% were considered to be the optimum and permissible range of moisture content of fresh rice straw for making high-quality silage.