草业学报2017，Vol.26Issue(12)：179-185,7.DOI:10.11686/cyxb2017135
单宁酸对绵羊日粮养分消化利用及氮代谢的影响
Effects of tannic acid on digestion and utilization of nutrients and the metabolic parameters of nitrogen in sheep
摘要
Abstract
An experiment was conducted to determine the effects of tannic acid on nutrient digestion and nitrogen metabolic parameters in sheep,in order to determine the appropriate amount of tannic acid in feed.Four fine-wool wethers (two years old and average live weight of 35±2.15 kg) fitted with permanent rumen fistula were selected and a 4× 4 Latin square design with 10 d preliminary and 6 d sampling experiment was used to study the effects of 4 different tannic acid contents on nutrient digestion and nitrogen metabolic profiles.The contents of tannic acid in diets were 0 (A),10 (B),15 (C),and 20 (D) g/kg DM.The results indicated that both feed intake and the intake of DM,OM,NDF and ADF were affected by the tannic acid in treatment D (20 g/kg DM) (P＞0.01),while the digestibility of DM,OM,NDF,ADF,Ca and P was unaffected by the acid contents (P＞0.05).The intake and digestion of N were higher in the A,B and C treatments than in treatment D (P＞0.01).N retention increased as the level of tannic acid increased (N retention in treatment C was higher than in treatment A).No differences were observed in N digestibility,pH and total nitrogen in rumen fluids (P＞0.05),whereas the levels of NH3-N and BUN decreased linearly.The level of NH3-N for diet A was higher than for D (P＜0.05) and BUN was higher in the C and D treatments (P＞0.01).In conclusion,tannic acid increased rumen bypass proteins.N retention was improved when the ratio of tannic acid was less than 15 g/kg DM,suggesting that the optimal tannic acid content in diets is less than this ratio.关键词
绵羊/单宁酸/营养/消化/氮代谢Key words
sheep/tannic acid/nutrients/digestion/utilization of nitrogen引用本文复制引用
潘发明,王彩莲,刁其玉,宋淑珍,郎侠,宫旭胤,张军成..单宁酸对绵羊日粮养分消化利用及氮代谢的影响[J].草业学报,2017,26(12):179-185,7.基金项目
甘肃省农业科学院中青年基金项目,甘肃省委组织部2016年陇原青年创新创业人才项目和甘肃省农业科学院中青年基金项目(2015GAAS30)资助. （2015GAAS30）
