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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 2010;23(10): 1333-1339.
https://doi.org/10.5713/ajas.2010.10077    Published online August 20, 2010.
Intermediary Metabolism of Plasma Acetic Acid, Glucose and Protein in Sheep Fed a Rice Straw-based Diet
M. K. Alam, Y. Ogata, Y. Sako, M. Al-Mamun, H. Sano
The present study was conducted to determine plasma acetate, glucose and protein metabolism using dilution of isotopes [[1-13C]Na acetate, [U-13C]glucose and [1-13C]leucine (Leu)] in sheep fed rice straw (Oriza japonica L.). Four sheep were assigned to either rice straw (RS-diet) or mixed hay (MH-diet) with a crossover design. Nitrogen (N) intake and N digestibility were lower (p = 0.002 and p = 0.02, respectively) for RS-diet than MH-diet, but N retention did not differ (p>0.10) between the diets. Concentrations of rumen acetate tended to be lower (p = 0.07), and propionate was higher (p = 0.02) for RS-diet than MH-diet. Concentrations of plasma lactate, non-esterified fatty acids, Leu and -ketoisocaproic acid did not differ (p>0.10) between the diets, but plasma glucose and urea concentrations were lower (p = 0.01 and p = 0.003, respectively) for RS-diet than MH-diet. Turnover rate of plasma acetate did not differ (p = 0.39) between the diets, and plasma glucose and Leu turnover rates were numerically lower (p = 0.15 and p = 0.14, respectively) for RS-diet than MH-diet. Whole body protein synthesis and degradation did not differ (p>0.10) between the diets. Thus it can be concluded that the intermediary metabolism of acetate, glucose and protein on rice straw is comparable to mixed hay in sheep.
Keywords: Rice Straw; Intermediary Metabolism; Mixed Hay; Stable Isotope; Sheep

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