Plasma levels of globulin -LSB- ( @ ) g/L vs. ( @ ) g/L , P < @ -RSB- , immunoglobulin G -LSB- ( @ ) g/L vs. ( @ ) g/L , P < @ -RSB- and complement @ -LSB- ( @ ) g/L vs. ( @ ) g/L , P < @ -RSB- on postoperative day @ were higher in early oral feeding group as compared to conventional oral feeding group .