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Studies on improving the nutritive value of rice straw by chemical treatment: IV. Effects of chemical treatment of rice straw on total microbial populations and the functional bacterial counts in the rumen of sheep



Studies on improving the nutritive value of rice straw by chemical treatment: IV. Effects of chemical treatment of rice straw on total microbial populations and the functional bacterial counts in the rumen of sheep



Korean Journal of Animal Nutrition and Feedstuffs 17(5): 278-284



This experiment was carried out to evaluate the effect of chemical treatment of rice straw on total microbial populations and the functional bacterial counts in the rumen Twelve Corriedale times Polworth crossbred rams weighing 50 kg in mean body weight were randomly alloted to 4 treatments(3 heads/treatment) of untreated-, sodium hydroxide treated-, ammonia treated- and hydrogen peroxide treated-rice straw diets. Rice straw was treated with 3% of sodium hydroxide, ammonia and hydrogen peroxide on the air dry basis of rice straw, respectively. 1. Feeding chemically treated rice straw diets increased the total bacterial and fungal populations, but not the protozoal population. 2. The viable counts of cellulolytic bacteria were increased when fed chemically treated rice straw diets, but the viable counts of sulfate reducing bacteria were decreased when fed ammonia treated- and hydrogen peroxide treated-rice straw diets, respectively. 3. The populations of amylolytic bacteria, xylan fermenter and pectin fermenter were decreased with sodium hydroxide treated- and ammonia treated-rice straw diets, respectively, but not affected by hydrogen peroxide treated-rice straw diets, compared to untreated-rice straw diets.

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