育肥猪饲粮蛋氨酸和苏氨酸适宜添加量的研究

Study on the optimum supplementation of methionine and threonine in diet of finishing pigs

选取150头杜×长×大三元杂交育肥猪,将其分为试验1(对照组)、2、3、4组和试验5组,每组30头猪。用基础饲粮(猪场现行饲粮)饲喂对照组猪;在基础饲粮中添加蛋氨酸0.075%和0.15%后,分别饲喂试验2组和试验3组猪;在基础饲粮中添加苏氨酸0.1%和0.2%后,分别饲喂试验4组和试验5组猪。试验结果:(1)试验3组猪平均日增重较对照组提高11.76%(P<0.05),试验2组猪平均日增重较对照组提高7.06%(P<0.05),试验4、5组猪平均日增重分别较对照组提高3.53%(P>0.05)、4.71%(P>0.05);试验3组猪每千克增重的饲料成本(8.45元/kg)最低,试验4、2、5组猪每千克增重的饲料成本(8.46、8.76元/kg和8.88元/kg)依次提高,对照组猪每千克增重的饲料成本(9.09元/kg)最高。(2)试验2、3组猪血清总蛋白质含量高于对照组(P<0.05),试验3、4、5组猪血清甘油三酯含量都低于试验1、2组(P<0.01),试验2、3组猪血清Ig G含量都高于对照组(P<0.05),试验3组猪血清GOT活性低于对照组和试验2组(P<0.05)。基于上述结果推断:在育肥猪基础饲粮(蛋氨酸含量为0.18%)中添加0.15%的蛋氨酸含量(即总含量为0.33%)较宜;添加适量(0.1%)的苏氨酸,能促进其生长,降低猪增重的饲料成本。

150 healthy, three-way crossbred（Duroc x Landrace x Yorkshire） finishing pigs were select- ed, and were randomly divided into five groups： the experimental group l（the control）, the experimen- tal group 2, 3, 4 and 5, each group 30 pigs. The control group pigs were fed to the basal diet （the cur- rent diet of the pig farm）; the experimental group 2 and 3 pigs were fed to the basal diet supplemented 0.075% and 0.15% methionine; the experimental group 4 and 5 pigs were fed to the basal diet supple- mented 0.1% and 0.2% threonine. The test results were as follows： ① ADG of the experimental group 3 increased by 11.76%（P〈0.05） compared with the control group pigs, ADG of the experimental group 2 increased by 7.06%（P〈0.05）, ADG of the experimental group 4, 5 increased respectively by 3.53% （P〉0.05） and 4.71%（P〉0.05）. The feed cost of per kilogram weight gain of the experimental group 3 （8.45 yuan/kg） was the least, the feed cost of per kilogram weight gain of the experimental group 4, 2 and 5 were respectively 8.46, 8.76 and 8.88 yuan/kg, the feed cost of per kilogram weight gain of the control group（9.09 yuan/kg） was the most. ② TP in the experimental group 2 and 3 pig serum was higher than the control group（P〈0.05）. TG in the experimental group 3, 4 and 5 pig serum was lower than the experimental group 1 and 2（P〈0.01）. IgG in the experimental group 2 and 3 pig serum was higher than the control group（P〈0.05）. GOT activities in the experimental group 3 pig serum were low- er than the control group and the experimentalgroup 2（P〈0.05）. Based to the results of the ex- periments, the conclusion was made：the optimum supplementation of methionine in finishing pig diet was 0.15%（in total 0.33%）; the supplementa-tion of threonine （0.1%） in finishing pig diet could promote tile growth of pigs and reduce the feed costs.