Abstract: 【Objective】To observe the effects of different carbohydrates on growth performance and biochemical parameters in weaned piglets for selecting cut-price carbohydrate resource used in the diet. 【Method】 One hundred and twenty Duroc x Landrace x Yorkshire piglets weaned at 28 days of age were randomly assigned to one of 5 treatment groups representing supplementation with corn (control group, CR), lactose (LAC), sucrose (SUC), glucose (GLU) and cornstarch (CS) at 6 percent of the total diet, respectively, to maize- and soybean meal-based diets. The experiment lasted twenty-eight days. Body weights and feed intakes were measured at the beginning and end of the tria. At the end of the experiment, the blood sample was collected from a male piglet from each replication for biochemical parameters assay, and then it was slaughtered to obtain duodenum and jejunum tissue for assay of disaccharidase activities. 【Result】ADG of gilts in GLU group was higher (P<0.05) compared with the SUC group; F/G of gilts in LAC group was lower than those of CR, GLU, SUC groups (P<0.05) and CS group (P<0.01); the incidence of diarrhea in SUC group was the most severe. The activities of lactase in duodenum and jejunum chymes, in LAC group were higher compared with the control and SUC groups (P<0.05), and GLU and CS groups (P<0.01); there was no significant difference in maltase activity between the LAC and CS group (P>0.05), but both higher (P<0.05) than those of the other 3 groups; the sucrase activities in the CR, SUC and CS groups were higher (P<0.05) compared with the GLU and LAC groups. In SUC group, the serum glucose concentration was higher (P<0.05) than that in CS group, and the serum Ca2+ concentration was higher (p<0.05) than those in CR and CS groups. There were no significant differences for other indexes among each group (P>0.05). 【Conclusion】Glucose could be used to substitute for lactose completely or partly in the diet for weaned piglet，while sucrose or cornstarch not be used singly in the diet.

Key words: carbohydrate, weaned piglet, growth performance, biochemical parameter