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Effect of ammoniation on the utilization of sawdust as sole source of roughage in complete pelleted diets for crossbred cattle



Effect of ammoniation on the utilization of sawdust as sole source of roughage in complete pelleted diets for crossbred cattle



Indian Journal of Animal Sciences 56(2): 248-253



The effect of anhydrous ammonia (NH3) treatment on the nutrient utilization and rumen fermentation pattern of teak sawdust as sole source of roughage in complete diets for crossbred cattle was studied in a 3 .times. 3 latin-square design. Three crossbred bulls with an average weight of 203 kg, fitted with rumen fistulae were randomly allotted the following diets, viz. (i) control diet containing 2 kg concentrate mixture and ad lib. mixed grass hay, (ii) complete diet (pellet) with sawdust and (iii) complete diet (pellet) with NH3-treated sawdust. Diet 2 was supplemented with urea at 0.75% level to make the two complete diets isonitrogenous. Ammoniation improved the organic matter and crude fibre digestibility, total digestible nutrients (P < 0.01) and nitrogen balance (P < 0.05) in diet 3 compared to that in diet 2. The digestibility of all nutrients except crude fibre and balances of nitrogen, calcium and phosphorus on ammoniated diet were comparable to control diet. The concentration of all nitrogen fractions were highest (P < 0.01) at 2 hr post-feeding except residual nitrogen which peaked at 4 hr post-feeding. Total nitrogen was highest (P < 0.01) with ammoniated diet and the concentrations of other nitrogen fractions (ammonia nitrogen, TCA-insoluble protein nitrogen and residual nitrogen) were comparable with the control diet with lowest levels of all nitrogen fractions with diet 2. Lowest pH and highest total volatile fatty acids (P < 0.01) were observed with diet 3. These results indicated that NH3-treated sawdust can be used as sole source of roughage in complete diets for maintenance of crossbred cattle.

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