对氨基苯胂酸对肥育猪生长性能和肉质的影响及其机理研究

Effects of PAPAA on Growth Performance and Meat Quality and Its Mode of Action in Finishing Swine

1 2 0头“长嘉 (兴 )”肥育猪按体重、性别和遗传基础分成对照组和试验组 (每组三个重复 ,每个重复2 0头 ) ,分别饲喂含对氨基苯胂酸 (PAPAA)为 0和 70mg/kg的饲粮 ,进行 80天饲养试验 ,随后屠宰测定。结果表明 ,添加PAPAA使日增重提高 8.7% (P <0 .0 5) ,饲料转化率提高 1 1 .5% (P <0 .0 1 ) ,胴体瘦肉率提高 6.7% (P <0 .0 5) ,脂肪率降低 3.5% (P <0 .0 5) ,并发现眼肌面积提高 9.3% (P <0 .0 5)、大理石纹评分提高 5.0 % (P <0 .0 5)。残留测定显示 ;停药 4天后肌肉中砷含量达到国家卫生标准。组织分析发现 :饲粮中添加PAPAA使猪血清生长激素 (GH)浓度升高 4 4.0 % (P <0 .0 5)、胰岛素降低 2 3.4 % (P <0 .0 5) ;背最长肌、肾上腺和腺垂体cAMP含量分别提高 4 8.6%、30 .3%和 57.5% (P <0 .0 3)。上述结果揭示PA

One hundred and twenty finishing pigs(Landrace×Jiaxing black pig) were assigned into control and treated groups by weight and sex and fed corn-soybean diet supplemented with O mg/kg or 70 mg/kg PAPAA respectively The results of feeding trial showed that PAPAA increased ADG of treated pigs by 8.7%(P<0.05)and increased FCR by 11.5%(P<0.01).The carcass composition analysis indicated that comparing to control graup, the treated group was higher in lean meat percentage(P<0.05)and marbling score and lower in fat percentage(P<0.05). PAPAA increasd serum GH concentration by 44.0%(P< 0.05), decreased insulin by 23.4%(P<0.05). It was also found that the content of cAMP in adenohypophysis, LD and adrenal was increasd by 57.5%(P<0.05),48.6%(P<0.05) and 30.3%(P<0.05) respectively. These results implicate that. PAPAA is involved in regulating the endocrine system to cause improved growth performance and carcass composition.