Effects of Feeding Soybean Protein Hydrolysate on Immunity Tissues and Organs in Early Weaning Piglet

This experiment was conducted to investigate the effect of soybean protein hydrolysate on the immunity tissues and organs and the level of serum interleukin-2 in early weaning piglet. Twelve piglets similar in weight were divided into two groups:a control group (in which the piglets were weaned at 28 days old,and fed on the early weaning feed) and a treatment group (in which the piglets were weaned at 21 days old,and fed on the early weaning feed plus (2 g) soybean protein hydrolysate daily for 10 days). The results indicated that compared with the control,feeding soybean protein hydrolysate enhanced the absolute and relative weight of thymus by 105.90% (P0.01) and 96.30% (P0.01) respectively,absolute and relative weight of spleen by 43.78% (P0.01) and 27.52% (P0.05) respectively,absolute and relative weight of groin lymph node by 28.89%(P0.05) and 15.22% (P0.05) respectively,and enhanced the level of serum interluekin-2 in early weaning piglet by 8.73% (P0.05), and increased the area of spleen′s lymph theca around center artery by 6.47% (P0.05), and increased the total number of ileum Peyer′s patches by four,but decreased the total area of ileum Peyer′s patches by (0.700 3 mm~2) (P0.05).