中文摘要：

选取新生仔猪18窝,随机分为试验组和对照组。自12日龄起,对照组饲喂基础乳猪料,试验组在基础日粮中添加120 mg/kg半胱胺,以耗竭内源性生长抑素。试验组和对照组均于35日龄断奶。分别在28、35、38、42和45日龄每组各选取6头猪屠宰采样。用RT-PCR方法,以18S rRNA作内标,定量分析空肠和十二指肠中生长素mRNA的表达及内源性SS对其表达的影响。结果表明:(1)十二指肠和空肠中均有生长素mRNA的表达;(2)十二指肠生长素mRNA水平在断奶前后呈逐渐下降趋势,38、45日龄时十二指肠生长素mRNA表达明显低于28、35日龄;45日龄时半胱胺显著提高了十二指肠生长素mRNA表达;(3)空肠生长素mRNA水平在38、42、45日龄时明显低于其他日龄点(P<0.05);38日龄时,半胱胺显著提高了空肠组织中生长素mRNA的表达(P<0.05)。以上结果提示,生长素在小肠黏膜组织中的表达呈年龄依赖性变化趋势,并具有组织特异性;半胱胺可通过耗竭生长抑素来促进小肠黏膜组织中生长素mRNA的表达。

英文摘要：

To study the expression of ghrelin mRNA in small intestinal tissue of weaning piglets and to investigate the effect of ghrelin on intestinal growth and functional development,to study the role of endogenous somatostatins as well.18 litters of newborn piglets were divided randomly to control and treatment groups.From 12 days of age,piglets in treatment group were fed starter diet supplemented with 120 mg/kg cysteamine to deplete endogenous somatostatin(SS).Piglets were weaned at 35 days of age(d35) in both g...