饲粮蛋白质及赖氨酸水平对早期断奶仔猪胃肠道消化酶活性、大肠蛋白质腐败作用和腹泻的影响

试验采用早期断奶仔猪（２５±３日龄，平均体重６．７８ｋｇ），用简单的玉米 豆粕 鱼粉型日粮饲喂，研究了不同蛋白质水平（１８％，２０％）和赖氨酸水平（１．０％，１．３％和１．６％）对仔猪胃肠道内容物消化酶活力、结肠蛋白质腐败作用和腹泻的影响。试验结果表明：日粮蛋白质水平较高时（２０％），仔猪腹泻率提高，这与大肠腐败作用无关；高蛋白质水平导致了大肠细菌活动的加强和小肠液淀粉酶活力的下降；不同赖氨酸水平对以上观测指标无影响。

Effect of Dietary Protein Levels and Lysine Levels on the Activity of Digestive Enzyme in the Gastro-intestinal Tract, Large Intestinal Protein Putrefaction and Diarrhoea Incidence

In this experiment, earlyweaned piglets, fed with simple cornsoybeanfish meal diet, were used to investigate the effects of different protein levels(18%,20%)and lysine levels(1.0%,1.3%and 1.6%)on the activities of digestive enzymes in gastrointestinal contents, the protein putrefaction in colons and the diarrhea incidence. The results showed that, higher dietary protein level(20%CP)increased diarrhea incidence, which was not caused by the protein putrefaction in colons; higher dietary protein level increased the activities of microbes in colons, decreased the activity of amyase in the small intestinal contents. Different lysine levels did not influence the measurements abovementioned.