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

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 PAA似通过影响猪的内分泌系统机能而发挥其促进生长和改善胴体组成的效果

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

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.