本试验旨在研究蛋氨酸锌（ZnMet）和维生素A（VA）对断奶仔猪生长性能及小肠前段肠道功能的影响。试验采用2因素3水平有重复析因设计，选择81头28日龄断奶、体重[（7.72±0.61）kg]相近的"杜×长×大"三元杂种仔猪，随机分为9个组，每组3个重复，每个重复3头猪，分别饲喂含0、300、400 mg/kg ZnMet及0、3 000、6 000 IU/kg VA的混合饲粮，试验期为21 d。结果表明：1）饲粮单独添加VA可显著提高仔猪平均日增重（ADG）（P<0.05）和显著降低料重比（F/G）（P<0.05）；饲粮单独添加ZnMet可显著提高仔猪ADG（P<0.05），但对F/G没有显著影响（P>0.05）；二者交互效应对仔猪ADG影响显著（P<0.05）。2）饲粮添加ZnMet和VA均使仔猪小肠隐窝深度显著降低（P<0.05），小肠绒毛宽度和绒毛高度显著增加（P<0.05），且两者互作效应显著（P<0.05）。3）饲粮单独添加ZnMet或VA均可显著提高小肠二糖酶活性（P<0.05），两者互作效应影响显著（P<0.05）。综上，饲粮中添加400 mg/kg ZnMet和6 000 IU/kg VA时，断奶仔猪生长性能达到最优效果，两者互作效应对仔猪ADG影响更显著；ZnMet和VA对改善仔猪小肠前段形态及提高小肠二糖酶活性有显著作用。

The object of this experiment was to investigate the effects of zinc methionine and vitamin A on growth performance and intestinal function of small intestinal front section of weaned piglets. A repetitive factorial design with two factors and three levels was used. A total of 81 "Duroc×Landrace×Large White" three-way hybrid piglets with a similar weaning weight of (7.22±0.61) kg at the age of 28 days were selected and randomly divided into 9 groups with 3 replicates in each group and 3 piglets in each replicate. Piglets were fed mixed diets containing 0, 300 or 400 mg/kg of zinc methionine and 0, 3 000 or 6 000 IU/kg of vitamin A, respectively. The experiment lasted for 21 days. The results showed as follows:1) dietary supplementation of vitamin A alone significantly increased the average daily gain (P<0.05) and significantly decreased the ratio of feed to weight (P<0.05). Diets supplemented with zinc methionine alone significantly increased the average daily gain (P<0.05), but had no significant effect on the ratio of feed to weight (P>0.05), and the interaction effects of zinc methionine and vitamin A had significant effects on average daily gain of piglets (P<0.05). 2) Dietary supplementation of zinc methionine and vitamin A significantly reduced the crypt depth of small intestine and increased the width and height of villus in weaned piglets (P<0.05), and the interaction effect was more significant (P<0.05). Dietary zinc methionine or vitamin A alone significantly increased intestinal disaccharide activities (P<0.05), and the interaction effect was even more pronounced (P<0.05). In conclusion, the results suggest that dietary zinc methionine at 400 mg/kg and vitamin A at 6 000 IU/kg can achieve the best growth performance of weaned piglets, and the interaction has more significant effects on the average daily gain of piglets. Zinc methionine and vitamin A have significant effects on improving morphology of small intestinal front section and enhancing intestinal disaccharide activities of piglets.