甜菜碱对肉雏鸡作用效果的研究

STUDIES ON THE EFFECTS OF BETAINEIN BROILER CHICKS

以添加６００、１３００、２０００和２７００ｍｇ／ｋｇ甜菜碱的饲粮分别饲喂１～２４日龄艾维茵雏鸡２４天，均明显地提高了采食量和生长速度，降低了料重比；并随添加剂量的增加呈增强趋势。添加２０００ｍｇ／ｋｇ甜菜碱组效果最为显著；与不添加蛋氨酸组比，采食量增加了８０７％（Ｐ＜００１），日增重提高了１２６２％（Ｐ＜００１），料重比降低了４３５％（Ｐ＜００１）。与添加２０００ｍｇ／ｋｇ蛋氨酸组比，采食量和日增重分别提高了６１６％（Ｐ＜００１）和６３９％（Ｐ＜００１），料重比降低了０６５％（Ｐ＞００５）。添加６００ｍｇ／ｋｇ甜菜碱组，采食量、日增重和料重比与添加２０００ｍｇ／ｋｇ蛋氨酸组效果基本一致（Ｐ＞００５）。此外，添加不同水平甜菜碱均明显改变了雏鸡的胴体组成和肉质。与不添加蛋氨酸组比，胸肌率显著提高（Ｐ＜００１），腹脂率明显降低（Ｐ＜００３），肌脂肪、肌酸和肌酸酐含量显著升高（Ｐ＜００５），与添加蛋氨酸组基本一致；但肌脂肪含量明显较高（Ｐ＜００４）。

? 810 Avian broiler chicks were allotted to six groups by weightEvery group included three replicate lots of fourty five birds eachThe groups received the same basal diet(301 Mcal/kg ME,2201% CP,029% Met,051% TSAA)supplemented with 0(Metunadded control group,MUG),600,1300,2000,2700mg/kg betaine respectively(test groups),or 2000 mg/kg methionine(Metadded control group,MAG)during the period 1 to 24 days posthatchingThe results of rearing trial showed that betaine obviously increased feed intake(FI) and average daily gain(ADG),decreased feed gain ratio(F/G),and that the respones were improved with betaine dosage increaseCompared with MUG,2000mg/kg betaine treated group was the most effective in increasing FI by 807%(P<001)and ADG by 1262%(P<001),decreasing F/G by 435%(P<001)Compared with MAG,2000mg/kg betaine improved FI by 616%(P<001)and ADG by 639%(P<001),reduced F/G by 065%(P<005),whereas 600mg/kg betaine had no significant difference(P<005)In addition,it was found that betaine apparently changed the carcass composition and meat quality by slaughter trialTest groups obviously enchanced percentage of breast(P<001),decreased percentage of abodominal fat(P<003),increased content of intermuscular fat(CIMF),of creatine and creatinine in muscule(P<005)in contrast to MUG,yet all didn′t distinguish from those of MAG except for the CIMF(P<004)