摘要
本研究基于生长性能和肉品质,评价胍基乙酸(GAA)对肉鸡的适用阶段和饲粮蛋氨酸(Met)配套强化效果。选取1日龄雄性爱拔益加肉仔鸡1920只,随机分为16组,每组设6个重复,每个重复20只鸡。试验分前期(1~21日龄)和后期(22~42日龄)2个饲养阶段,1组为对照组,饲喂常规饲粮(Met水平前期为0.50%,后期为0.40%)。2~6组仅在前期设置Met或GAA处理,其中,2组只把饲粮Met的水平提高至0.65%;3~6组采用双因素完全随机设计,2个饲粮Met水平分别为0.50%和0.65%,2个GAA添加量分别为300和600 mg/kg。7~11组仅在后期设置Met或GAA处理,其中,7组只把饲粮Met水平提高至0.55%;8~11组采用双因素完全随机设计,2个饲粮Met水平分别为0.40%和0.55%,2个GAA添加量分别为400和800 mg/kg。12~16组在全期(1~42日龄)设置Met或GAA处理,前期和后期饲粮设置分别同2~6组和7~11组。试验期42 d。结果发现:1)与对照组相比,只在前期饲喂高剂量GAA并强化Met供应能够显著提高1~21日龄平均日增重和21日龄体重(P<0.05),显著降低1~21日龄料重比(P<0.05);仅在后期饲喂高剂量GAA能够显著提高22~42日龄平均日增重,显著降低22~42日龄料重比(P<0.05),同时强化Met供应还可显著提高1~42日龄平均日增重及42日龄体重、胸肌指数(P<0.05),显著降低22~42日龄和1~42日龄料重比及42日龄腹脂指数(P<0.05);全期饲喂高剂量GAA能够提高22~42日龄和1~42日龄平均日增重及42日龄体重和胸肌指数(P<0.05),显著降低22~42日龄和1~42日龄料重比及42日龄腹脂指数(P<0.05),同时强化Met供应还可显著提高1~21日龄平均日增重和21日龄体重(P<0.05),显著降低1~21日龄、22~42日龄和1~42日龄料重比(P<0.05)。2)与对照组相比,全期单独强化饲粮Met或联合添加低剂量GAA可以显著降低42日龄胸肌、腿肌亮度(L^∗)值和剪切力(P<0.05),提高红度(a^∗)值和24 h pH(pHu)(P<0.05);单独饲喂GAA对肉品质无显著影响(P>0.05)。由此可见,当全�
A study was conducted to evaluate the appropriate period of guanidinoacetic acid(GAA)for broiler chickens and the effects of dietary methionine(Met)fortification,in terms of growth performance and meat quality.A total of 1920 one⁃day⁃old male Arbor Acres broiler chickens were randomly allotted into 16 groups with 6 replicates per group and 20 birds per replicate.The experiment was divided into starter period(1 to 21 days of age)and later period(22 to 42 days of age).Chickens in group 1 served as the control group,and fed a normal diet(Met level in starter period was 0.50%,and in later period was 0.40%).Groups 2 to 6 were treated with Met or GAA only during the starter period,among them,dietary Met level increased to 0.65%in group 2,a completely randomized design with a 2×2 factorial arrangement was applied to groups 3 to 6,diet⁃ary Met levels were 0.50%and 0.65%,and GAA supplementation was 300 and 600 mg/kg.Groups 7 to 11 were treated with Met or GAA only during the later period;among them,dietary Met level increased to 0.55%in group 7,a completely randomized design with a 2×2 factorial arrangement was applied to groups 8 to 11,dietary Met levels were 0.40%and 0.55%,and GAA supplementation was 400 and 800 mg/kg.Groups 12 to 16 were treated with Met or GAA during the whole period(1 to 42 days of age);starter period and later peri⁃od diets were identical to groups 2 to 6 and groups 7 to 11,respectively.The experiment lasted for 42 days.The results showed as follows:1)compared to the control group,feeding a high dose of GAA plus Met fortifi⁃cation only during the starter period could significantly increase the average daily gain during 1 to 21 days of age and body weight at 21 days of age(P<0.05),and significantly decreased the ratio of feed to gain during 1 to 21 days of age(P<0.05);feeding a high dose of GAA only during the later period could significantly in⁃crease the average daily gain during 22 to 42 days of age(P<0.05),and significantly decreased the ratio of feed to gain during 22 to 42 days of
作者
赵景鹏
孙明发
李培勇
张俊玲
杨立彬
林海
ZHAO Jingpeng;SUN Mingfa;LI Peiyong;ZHANG Junling;YANG Libin;LIN Hai(Shandong Key Laboratory of Animal Biotechnology and Disease Control,College of Animal Science and Technology,Shandong Agricultural University,Tai’an 271018,China;Beijing Gendone Agricultural Technology Co.,Ltd.,Beijing 100085,China)
出处
《动物营养学报》
CAS
CSCD
北大核心
2020年第2期691-705,共15页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
国家重点研发计划（2016YFD0500510）
国家自然科学基金（31672442）
山东省“双一流”建设奖补资金
北京君德同创农牧科技股份有限公司委托项目
关键词
胍基乙酸
蛋氨酸
饲养阶段
生长性能
肉品质
肉鸡
guanidinoacetic acid
methionine
feeding period
growth performance
meat quality
broiler chickens
