Energy metabolism and protein balance in growing rats fed different levels of dietary fibre （soybean hulls） and protein
作者单位：Danish Institute of Agricultural Sciences. Department of Animal Nutrition and Physiology.Research Centre Foulum. P.O. Box 50. DK-8830 Tjele Denmark. Northwest Plateau Institute of Biology. The Chinese Academy of Sciences. Xining. 810001 P.R. China. Danish Institute of Agricultural Sciences. Department of Animal Nutrition and Physiology.Research Centre Foulum. P.O. Box 50. DK-8830 Tjele Denmark. Northwest Plateau Institute of Biology. The Chinese Academy of Sciences. Xining. 810001 P.R. China. Danish Institute of Agricultural Sciences. Department of Animal Nutrition and Physiology.Research Centre Foulum. P.O. Box 50. DK-8830 Tjele Denmark. Northwest Plateau Institute of Biology. The Chinese Academy of Sciences. Xining. 810001 P.R. China.
会议日期：2002年
学科分类：090502[农学-动物营养与饲料科学] 0905[农学-畜牧学] 09[农学]
关 键 词：heat production ileal digestibility energy utilization
摘 要：正SummaryA study was performed to investigate the effect of different levels of dietary fibre （DF） and dietary prolein on visceral organ size, digestibility, nitrogen balance and energy metabolism in rats. Thirty-six male Wistar rats, initial body weight about 76 g. were used in a factorial design consisting of three levels of dietary fibre （low, 81 g/kg DM;medium, 215 g/kg DM and high. 326 g/kg DM） and two levels of dietary prolein （low, 120 g/kg DM and high. 223 g/kg DM）. The added fibre source was soybean hulls. Danish fish meal was used as sole source of dietary protein. Measurements of gas-exchange were done on six rats （one group） and urine and faeces were collected individually. The weight of the digestive tract was larger （P0/05） in rats fed the high fibre diet than in those fed the low fibre diet. As the level of soybean fibre increased, the digestibility of nutrients and energy linearly decreased. The apparent biological value decreased with increasing DF when rats were fed the high protein diet whereas no significant difference was found with increasing DF in rats fed the low protein diet. Heat production as a percentage of metabolisable energy was higher in rats fed the low protein diet than in rats fed the high protein diet, but no significant difference was found among DF levels. The low heat production in rals fed high fibre diet is probably due to an improved utilization of metabolisable energy for fat deposition compared to protein deposition.