Three experiments were conducted to investigate the influence of different dietary starch sources on the performance of growing pigs and the relative mechanisms. Base on the comparison of different feeding effect of dietary starch sources, starch in vivo digestion and absorption as well as it's effect on amino acids digestion and utilization was further studied. The reasons for the different feeding effect of dietary starch sources were elucidated from both digestive tract and portal-drained viscera absorpt...