日粮纤维对猪营养物质消化率、消化道发育及消化酶活性的影响

使用甜菜渣和苜蓿草粉作为生长猪日粮主要纤维来源，研究日粮中不同含量的纤维对生长猪营养物质消化率、消化道发育和消化酶活性的影响。试验将60头体重为30kg左右的“杜长大”三元杂交猪分为3组，3个组粗纤维含量分别为3%、6%和8%。结果表明，（1）日粮中总能、干物质、粗蛋白和中性洗涤纤维随纤维含量的提高，呈现显著的下降趋势（p<0.05）。（2）将日粮中的粗纤维含量提高到8%，显著促进了胰脏和结肠的发育（P>0.05）；（3）将日粮中的粗纤维含量提高到8%，显著增加了十二指肠中的总水解蛋白酶、胰蛋白酶和胰糜蛋白酶的活性（P<0.05）。

Effect of Dietary Fiber on Nutrient Digestibility, Development of Digestive Tract and Activity of Digestive Enzyme in Growing Pigs

Sugar beet pulp and alfalfa hay meal were selected as main fiber sources in tested diets to study on the effects of three levels of dietary fiber on nutrient digestibility, development of digestive tract and activity of digestive enzyme in growing pigs. 60 pigs (Duroc×Landrace×Yorkshire) were divided into three groups. Three levels of fiber were 3%, 6% and 8%. The results showed: (1) The digestibility of gross energy, dry matter, crude protein and neutral detergent fiber decreased significantly with increasing fiber level (p<0.05); (2) The level of crude fiber was 8%, significant trophic effect on the pancreas and colon were found (p<0.05); (3) The activity of proteolytic enzyme, trypsin, chymotrypsin increased (p<0.05) in the pancreas.