不同日粮来源淀粉在断奶仔猪小肠不同部位的消化与体外降解.docVIP

不同日粮来源淀粉在断奶仔猪小肠 不同部位的消化及体外降解研究 谭碧娥100039；3广西师范大学生命科学学院，广西桂林 541004） 摘要：【目的】比较不同日粮来源淀粉在断奶仔猪小肠不同部位的消化率及体外降解的差异，为合理利用谷物淀粉提供理论依据。【方法】选用28日龄断奶杜×长×大三元杂交仔猪（体重8.0±0.6 kg）20头，随机分成4组，分别饲喂4种不同来源淀粉日粮，即玉米日粮、糙米日粮、糯米日粮和抗性淀粉日粮，通过体内消化、体外酶解技术测定不同来源淀粉在仔猪小肠不同部位的消化率和体外降解率及降解速度。【结果】与其它3种日粮相比，糯米日粮来源的淀粉在断奶仔猪空肠前段和后段、回肠前段和后段测得的消化率及其体外降解率均有显著提高（P＜0.05）；小肠不同部位淀粉消化率与直链淀粉和支链淀粉食入量之间呈显著的回归关系；糯米日粮来源淀粉在体外的降解速度和各孵育时间的降解率也均显著高于其它3种日粮（P＜0.05）。【结论】不同日粮来源的淀粉到达小肠不同部位时的消化和体外降解程度存在显著差异，可以作为合理选择仔猪日粮淀粉来源的依据。 关键词：淀粉来源；小肠；消化率；降解率；断奶仔猪 Study on Digestion in Small Intestine and in vitro Degradation of Different Dietary Starches in Weaned Piglets TAN Bi-e1,2, BIN Shi-yu1,3, KONG Xiang-feng1, CHU Wu-ying1, HUANG Rui-lin1, LI Tie-jun1,2, YIN Yu-long1 (1Laboratory of Animal Nutrition and Health, Institute of Subtropical Agriculture, the Chinese Academy of Sciences, Changsha 410125; 2The Graduate School of the Chinese Academy of Sciences, Beijing 100039; 3College of Life Sciences, Guangxi Normal University, Guilin 541004, Guangxi) Abstract: 【Objective】 The study was conducted to compare digestibility of different dietary starches n different small intestine segments and in vitro degradation in order to effectively utilize dietary starch resource. 【Method】 Duroc×Landrace×Yordshire piglets (average BW of 8.0±0.6 kg) weaned at 28 day of age were randomly assigned to 4 treatment groups and fed with corn, brown rice, glutinous rice or resistant starch (RS) diets, respectively. The digestibility of different starches on different segments of small intestine and the starch degradation in vitro were determined by slaughter technique and enzyme-decomposition method, respectively. 【Result】 The starch digestibility of glutinous rice starch diet was measured in anterior jejunum, posterior jejunum, anterior ileum and posterior ileum, and the degradation in vitro increased (P＜0.05) compared with the other 3 groups. The digestion of the starch on different segments of small intestine showed a correlation wit