Z.T. Song , X.F. Dong, J.M. Tong , Z.H. Wang
Abstract:The aim of this study was to evaluate apparent metabolizable energy (AME) of waste vinegar residue(WVR) and to evaluate the effects of WVR on nutrient digestibility and nitrogen excretion in laying hens. In the first experiment the AME value and the nitrogen-corrected apparent metabolizable energy (AMEn) of WVR were studied by feeding hens 0, 100, 150, or 200 g/kg WVR. In the second experiment, 9638-wk-old Hy-line laying hens were divided into four treatment groups, fed corn–soybean meal-based diets with 0, 20, 40, and 60 g/kg WVR, and nutrient digestibility and nitrogen excretion were measured. Regression analysis revealed that the AME and AMEn value of the WVR were 650 kcal/kg and 716kcal/kg respectively. Diet including 40 g/kg WVR increased total tract apparent digestibilities (TTADs) of nitrogen (P=0.006) of hens. Inclusion of 60 g/kg WVRin the diet resulted in lower TTADs of dry matter (P=0.005). Inclusion of 40g/kg WVR in the diet significantly decreased the nitrogen excretion (P=0.006)and uric acid N excretion (P<0.001). These results suggest that inclusion of40 g/kg WVR in laying hen diet reduces nitrogen excretion.
Keywords:Waste vinegar residue; Nutrient digestibility; Nitrogen balance; Laying hen