动物营养学报Issue(1)：79-91,13.DOI:10.3969/j.issn.1006-267x.2016.01.012
支链氨基酸对肉鸡生长性能及肠道发育的影响
Effects of Branched-Chain Amino Acids on Growth Performance and Intestinal Development of Broilers
摘要
Abstract
This experiment was conducted to investigate the effects of branched-chain amino acids ( BCAAs) on the growth performance and intestinal development of broilers.Three hundred and eighty-four one-day-old Arbor Acres ( AA) healthy male broilers were randomly assigned into four groups with 6 replicates per group and 16 broilers per replicate.Each group was offered one of the following diets with different BCAAs levels:3.04%, 3.93%, 4.82%and 5.71%, respectively.The ratio of leucine (Leu), isoleucine (Ile) and valine ( Val) was 1.8∶1.0∶1.2.The experiment lasted for 21 days and all birds were free to feed and water.The re-sults showed that there was no significant difference in body weight or average daily gain among all groups ( P>0.05) , while the average daily feed intake in 5.71%group was significantly lower than that in 3.04%group ( P<0.05) , the ratio of feed to gain in 4.82%and 5.71%groups was significantly lower than that in 3.04%group ( P<0.05) .At age of 14 and 21 days, the weight of unit length of duodenum and jejunum of broilers, as well as the relative weight of jejunum rose with the increasing level of BCAAs from 3.04%to 4.82%.Addi-tionally, at age of 14 and 21 days, the weight of unit length of duodenum in 4.82%group was significantly higher than that in 3.04%group ( P<0.05) .At age of 14 and 21 days, the weight of unit length of duodenum and the relative weight of jejunum were significantly decreased as the level of BCAAs increased from 4.82%to 5.71%( P<0.05) .At age of 14 and 21 days, the villus height of duodenum and ileum in 4.82%group was significantly higher than that in 3.04%group ( P<0.05) .At age of 10 and 14 days, the villus height of jeju-num in 4.82%group was significantly higher than that in 3.04%group ( P<0.05) , while the villus height of the small intestine in 5.71%group was significantly lower than that in 4.82%group ( P<0.05) .Furthermore, no significant differences were found in crypt depth of jejunum between 5.71%and 3.04%groups ( P>0.05) . At age of 10 and 21 days, the crypt depth of jejunum in 4.82%group was significantly higher than that in 3.93%group ( P<0.05) .At age of 10, 14 and 21 days, the ratio of villus height to crypt depth ( V/C) of je-junum and ileum in 5.71%was the lowest among all groups, but no significant difference was found when compared with 3.04%group ( P>0.05).The V/C of jejunum and ileum in 3.93%group was significantly higher than that in 5.71%group ( P<0.05) .In conclusion, under the situation of this experiment, with the in-crease of BCAAs level, the ratio of feed to gain can decrease;the addition of BCAAs with appropriate amount can promote intestinal development of broilers, while excessive addition can significantly decrease average daily feed intake and lead to the postponed development of the small intestine.关键词
支链氨基酸/肉鸡/生长性能/肠道发育Key words
branched-chain amino acids/broilers/growth performance/intestinal development分类
农业科技引用本文复制引用
常银莲,刘国华,常文环,张姝,郑爱娟,蔡辉益..支链氨基酸对肉鸡生长性能及肠道发育的影响[J].动物营养学报,2016,(1):79-91,13.基金项目
国家肉鸡产业技术体系建设资助 （）
