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Studies on improving the nutritive value of rice straw by chemical treatment: I. Effects of chemical treatment of rice straw on chemical composition, ruminal fermentation characteristics and in vitro digestibility of rice straw



Studies on improving the nutritive value of rice straw by chemical treatment: I. Effects of chemical treatment of rice straw on chemical composition, ruminal fermentation characteristics and in vitro digestibility of rice straw



Korean Journal of Animal Nutrition and Feedstuffs 17(4): 224-231



This experiment was conducted to evaluate the effect of chemical treatment of rice straw on chemical composition, fermentation characteristics and in vitro digestibility of rice straw. Rice straw was treated with 3% of sodium hydroxide, ammonia and hydrogen peroxide on the air dry basis of rice straw, respectively, and compared with untreated rice straw in relation to the effect of chemical treatment of rice straw. For determining ruminal fermentation characteristics, 16 ruminal-fistulated Corridale times Polworth crossbred lambs weighing 34 kg m mean body weight were randomly alloted to 4 treatments (4 heads/treatment) of untreated-, sodium hydroxide treated-, ammonia treated-and hydrogen peroxide treated-rice straw diets. 1. Crude protein content of rice straw was increased with ammonia treatment by 210% (P lt 0.01), but decreased with sodium hydroxide treatment by 32% (P lt 0.01). Neutral detergent fiber (NDF), significantly (P lt 0.01), and acid detergent fiber(ADF), but not significantly, of rice straw were reduced by chemical treatment, compared to those of untreated-rice, straw. Estimated hemicellulose content of rice straw was decreased by chemical treatment. 2. Ruminal pH values of sheep fed chemically treated rice straw diets, particulary when fed ammonia treated- and hydrogen peroxide treated- rice straw diets, were lower than those of sheep fed untreated-rice straw dietes (P lt 0.05). Ruminal NH-3-N concentrations were higher with ammonia treated-rice straw diets (P lt 0.05) compared to other rice straw diets, Total volatile fatty acids and acetate concentrations were increased with chemically treated rice straw diets (P lt 0.05). 3. In vitro dry matter digestibility of rice straw was enhanced by chemical treatment (P lt 0.05), but no differences were found between the 1st stage- and the 2nd stage- in vitro dry matter digestibility.

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