| Agricultural sciences |
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| Effects of dietary glutamine supplementation on growth performance,nutrient utilization efficiency and digestive organ development in Lingnan yellow broilers |
| TANG Sheng-qiu1,DONG Xiao-ying1,CHEN Jian-rong1,DU Xiong-wei2,LIU Hou-sen1 |
| 1 . College of Yingdong Agricultural Science and Engineering , Shaoguan University , Shaoguan ,Guangdong 512005 , China ;2 . Dalian Center for Animal Disease Control and Prevention , Dalian , Liaoning 116037 ,China |
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Abstract The effects of dietary glutamine (Gln) supplementation on growth performance, nutrient utilization efficiency and digestive organ development in Lingnan yellow broilers were investigated. One hundred and forty -four Lingnan yellow broilers at 14 day age were randomly divided into four groups(six repeats in each group, six broilers in each repeat) and fed diets supplemented with0 (control) , 0.2%,0.4% and0.6% Gln, respectively. The growth performance and nutrient utilization were measured at 14-28 day age, 29-42 day age,and the end of the test. The tissues were sampled after slaughtering at 42 day age and used to analyze digestive organ development of broilers. The results showed that: compared with the control, 0.2% Gln in diet could improve mucosa thickness of duodenum in broilers significantly( P＜0.05) , but had no effects on villus height, crypt depth and thickness of jejunum( P＞0.05) ; 0.4% Gln could significantly increase villus height and thickness of duodenum,villus height of jejunum ( P＜ 0.01) , lower crypt depth of duodenum and jejunum,and increase mucosa thickness of jejunum ( P＜0.05). At 14-28day age, 0.4% Gln could increase average daily feed intake and averagedaily mass gain,lower feed conversion ratio of broilers significantly( P＜0.05) ,promote digestibility of dry matter and crude protein in diets ( P＜0.05) .The addition of 0.4% Gln also improve dutilization of crude fiber in diets at 29-42 day age ( P ＜ 0.05) .Adding 0.6%％ Gln in diet could decrease mass of stomachus muscularis significantly ( P ＜ 0.05 ) ,promote average daily mass gain of 14-28 day -old broilers,and increase average daily feed intake, average daily mass gain and dry matter utilization of diet ( P＜0.05) and down -regulatefeed conservation ratio significantly ( P ＜0.05 ) at 29-42 day age. In conclusion,dietary Gln supplementation, especially 0.4% Gln treatment can improve digestive organ development, nutrient utilization and growth performance in Lingnan yellow broilers.
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Published: 25 March 2011
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谷氨酰胺对岭南黄肉鸡生长性能、养分利用率与消化器官发育的影响
将144羽14日龄岭南黄肉鸡随机分成4组( 每组6个重复 , 每个重复6羽 ) , 在各组基础日粮中分别添加0(CK) 、0.2%、0.4%和0.6%的谷氨酰胺(glutamine, Gln) , 饲养试验分为14~28、29~42日龄2个阶段 , 测定其生长性能与养分利用率 , 并于42日龄进行屠宰 , 取样分析消化器官的发育情况 . 结果表明 : 与对照组相比 , 岭南黄肉鸡日粮中添加0.2% Gln 显著提高十二指肠黏膜厚度 ( P＜ 0.05) , 对其他试验指标无显著影响 ( P＞0.05) ; 添加0.4% Gln 极显著提高肉鸡十二指肠绒毛高度、黏膜厚度与空肠绒毛高度 ( P＜0.01) , 显著降低十二指肠、空肠隐窝深度与增加空肠黏膜厚度 ( P＜0.05) , 在14~28日龄极显著提高平均日采食量与平均日增质量 ( P＜0.01) , 显著降低料质量比 ( P＜0.05) , 显著提高干物质与粗蛋白利用率 ( P＜ 0.05) ,29~42日龄显著提高粗纤维利用率 ( P＜0.05) ; 添加0.6% Gln 显著降低肌胃指数 ( P＜0.05) , 在14~28日龄显著提高平均日增质量 ( P＜0.05) , 29~42日龄显著增加平均日采食量、平均日增质量与干物质利用率 ( P＜0.05) , 并显著下调料质量比 ( P＜0.05) . 由此可知 , 在岭南黄肉鸡日粮中适量添加 Gln 能促进消化器官发育 , 并提高养分利用率与生长性能 , 尤以0.4% Gln 的添加效果最为理想 .
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