Author/Authors :
Harjanti ، D. W. نويسنده Department of Animal Sciences, Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan. , , Sugawara ، Y. نويسنده Department of Animal Sciences, Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan. , , Al-Mamun ، M. نويسنده Department of Animal Sciences, Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan. , , Sano ، H. نويسنده Department of Animal Sciences, Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan. ,
Abstract :
The effects of replacing concentrate with soybean curd residue silage on the plasma leucine (Leu) and glucose turnover rates (LeuTR and GluTR) of sheep were evaluated using an isotope dilution method of [1-13C]Leu and [U-13C]glucose. The ruminal characteristics and nitrogen (N) balance of the sheep were also determined. The sheep were fed two diets in a crossover experiment for 21 days. The first diet consisted of 80% mixed hay and 20% commercial concentrate (CON diet), and the second diet consisted of 80% mixed hay and 20% soybean curd residue silage (SCRS diet), on a dry matter basis for both diets. The primed-continuous infusion method of [1-13C]Leu and [U-13C]glucose was performed on day 21. The N absorption, N retention, and N digestibility did not differ between the diets. Furthermore, the ruminal total volatile fatty acid concentration did not differ, but the molar concentration of propionate was significantly higher (P=0.02) in the sheep fed the SCRS diet than the CON diet. The plasma LeuTR and GluTR were comparable between the diets. The results showed that soybean curd residue silage could be comparable with commercial concentrate on ruminal fermentation as well as on the plasma Leu and glucose kinetics. Thus, soybean curd residue silage could be used to replace commercial concentrate in the diet of sheep.
