甲基氨基酸对不同阶段肉猪生长性能的影响及机理探讨

研究了2种甲基氨基酸对商品猪不同阶段生长性能的影响,并探讨了其作用机理.结果表明:日粮中添加50 mg/kgN-甲基D,L-天冬氨酸均能显著提高仔猪、生长猪和肥育猪的日增重,降低料重比,其中对肥育猪的效果尤佳,平均日增重提高了9.65%(P＜0.05),料重比下降了9.59%(P＜0.05).日粮中添加1000 mg/kg甜菜碱对猪各阶段的生长均有促进作用,对生长猪的效果最为理想,平均日增重提高了13.20%(P＜0.01),料重比下降了7.93%(P＜0.05).机理研究表明:甲基氨基酸可显著提高猪血清T3、GH和IGF-1水平,增加腺垂体、肾上腺中的cAMP含量.上述结果提示:甲基氨基酸通过调节神经内分泌,提高了猪GH和IGF-1水平,促进生长,加快了饲料转化效率.

Effects of methylamino acids on growth performance of swine in different stages

This trial was conducted to investigate the effects of two kind of methylamino acids on growth performance of swine in different stages , and approach the mechanism involved. The results showed that a diet supplemented with 50 mg/kg N methyl D,Laspartate. improved performance of young piglets as well as growing and finishing pigs, and best result was obtained at the finishing stage, during which the average daily gain increased by 9.65%( P <0.05), and feed grain ratio decreased by 9.59%( P <0.05). Addition of 1000 mg/kg betaine into the diet also improved performance of swine, the growing swine stage being most suitable, which increased average daily gain by 13.20%( P <0.05), and decreased feed grain ratio by 7.93%( P <0.05). Study on the mechanism indicated that this two kind methylamino acids caused remarkable increase in the serum level of T3, the growth hormone and IGF 1, and uprised cAMP concentration in pituitary and adrenal gland of swine in various stages. It was concluded that methylamino acids might regulate neuroendcrine, stimulate growth hormone and IGF 1 secretion,and improve growth performance of swine.