中文摘要：

为研究开食料中性洗涤纤维（ NDF）水平对1～35日龄羔羊生长性能和消化道发育的影响，本试验选用24只体况良好、初生重[（3．01＆#177;0．12）kg]相近的湖羊初生公羔，采用单因素随机分组设计分为4组，每组6只羔羊，对照组随母哺乳不补饲，高、中、低NDF组在随母羊哺乳的基础上从7日龄开始自由采食NDF水平分别为17．01％、13．65％和11．32％的开食料。35日龄屠宰，测定消化道各部位的重量、容积以及各肠段的长度。结果表明：1）高NDF组末重、平均日增重和胴体重显著高于对照组（ P＜0．05），其胴体重也显著高于低NDF组（ P＜0．05）。2）高、中、低NDF组瘤网胃重量均显著高于对照组（ P＜0．05），高NDF组瘤网胃容积显著高于对照组（P＜0．05）；高NDF组皱胃重量显著高于对照组和低NDF组（P＜0．05）。3）高、低NDF组空肠重量显著高于对照组（ P＜0．05），高NDF组空肠容积显著高于对照组（ P＜0．05）。综合各项指标可认为本试验条件下，哺乳羔羊适宜的开食料NDF水平为17．01％，该水平下羔羊生长性能和消化道发育状况最好。

英文摘要：

In order to investigate the effects of neutral detergent fiber（ NDF）level of starter on growth per-formance and digestive tract development of suckling lambs,twenty-four healthy new born male Hu lambs with similar birth weight[（3.01＆#177;0.12）kg]were divided into 4 groups with 6 lambs in each group by a one factor design. Lambs in control group were ewe reared without dietary supplementation,and those in high,medium and low NDF groups were ad libitum fed starter with 17.01%,13.65% and 11.32% NDF,respectively,based on ewe reared from 7 days of age. All lambs were slaughtered at 35 days of age to determine weight and the volume of each part of digestive tract and the length of each part of intestinal tract. The results showed as fol-lows：1）final weight,average daily gain and carcass weight of high NDF group were significantly higher than those of control group（ P〈0.05）,and carcass weight of high NDF group was significantly higher than that of low NDF group（P〈0.05）. 2）Abomasum weight of high,medium and low NDF groups was significantly higher than that of control group（ P〈0.05）,and reticulorumen volume of high NDF group was significantly higher than that of control group（P〈0.05）;abomasum weight of high NDF group was significantly higher than that of control group and low NDF group（ P〈0.05）. 3）Jejunum weight of high and low NDF groups was significantly higher than that of control group（ P〈0.05）,and jejunum volume of high NDF group was signifi-cantly higher than that of control group（P〈0.05）. It is concluded that the optimal NDF level of starter for suckling lambs is 17.01% under the conditions in the present study,and lambs can obtain best growth perform-ance and digestive tract development under the above level.