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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 2010;23(8): 1022-1027.
DOI: https://doi.org/10.5713/ajas.2010.90412    Published online June 21, 2010.
Effects of Increasing Level of Dietary Rice Straw on Chewing Activity, Ruminal Fermentation and Fibrolytic Enzyme Activity in Growing Goats
M. Wang, X. G. Zhao, Z. L. Tan, S. X. Tang, C. S. Zhou, Z. H. Sun, X. F. Han, C. W. Wang
Effects of increasing dietary rice straw on chewing activity, ruminal fermentation, and fibrolytic enzyme activity in growing goats were investigated in a 4?? Latin Square experiment. The goats were offered four diets with an increasing proportion of rice straw (i.e. 0.05, 0.10, 0.15 and 0.20, respectively, on dry matter basis). Increasing level of rice straw increased (Plinear effect<0.05) the time spent on eating, ruminating, and chewing. The ruminal pH and acetate: propionate ratio were increased (Plinear effect<0.05), while the NH3-N concentration was decreased (Plinear effect<0.01). Increasing level of rice straw in the diet increased (Plinear effect??.01) molar proportion of acetate and isovalerate, and decreased (Plinear effect<0.01) molar proportion of propionate. The CMCase, xylanase and cellobiase activities in the rumen were decreased (Plinear effect<0.05) with increasing level of dietary rice straw, whereas the avicelase activity was increased (Plinear effect<0.01). In summary, increased level of rice straw elevated the dietary neutral detergent fibre (NDF) content in the diet and had a great impact on chewing activity and ruminal fermentation.
Keywords: Rice Straw; Dietary NDF; Ruminal Fermentation; Fibrolytic Enzyme; Chewing Activity

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