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An experiment was conducted to investigate the effect of microbial phytase Natuphos^(ⓡ) supplementation, individually and in combination with carbohydrase enzyme complex (composed of enzymes targeted to SBM dietary components such as α-galactosides and galactomannans； ENDO-POWER^(ⓡ)) to corn-soy basis diet with low nutrient levels on growth performance and nutrient digestibility of growing pigs. A total of 48 crossbred four dietary treatments, based on weight and age, according to Randomized Complete Block Design. There were three pens per treatments and 4 pigs per pen. the dietary treatments were 1) CON (control diet with 3,380㎉／㎏ of metabolizable energy, 18.96％ of crude protein, 1.10％ of lysine, 0.75％ of calcium and 0.35％ of available phosphorus), 2) LP＋NTPS (CON diet with 0.15％ unit lower available P levels ＋ 0.1％ phytase (500 Ftu／㎏； Natuphos^(ⓡ)), 3) LEL＋ENP (CON diet with 3.0％ unit lower ME and lysine levels＋0.1％ carbohydrase enzyme complex (ENDO-POWER^ⓡ)), and 4) LPEL＋ENZ (CON diet with 0.15％ unit lower available P levels and 3.0％ unit lower ME and lysine levels＋0.1％ ENDO-POWER^(ⓡ) and 0.1％ Natuphos^(ⓡ) (500 FTU／㎏). There was no significnat difference (p＞0.05) in average daily gain (ADG), average daily feed intake (ADFI) and feed conversion ratio (FCR) among dietary treatments during the whole experimental period (0 to 4 weeks). Apparent digesibility of gross energy was greater in LP＋NTPS and LPEL＋ENZ groups than in the LEL＋ENP (p＜0.05). Apparent digestibioity of phosphorus was greater in LP＋NTPS than in LEL＋ENP (p＜0.05). Dry matter excretion was lowest in LPEL＋ENZ and phosphorus excretion was lowest in LP＋NTPS (p＜0.05). Overall, pigs fed on LPEL＋ENZ group tended to have better nutrient digestibility (dry matter, gross energy, crude protein and phosphorus) than pigs fed on control group. All dietary enzyme treatment groups showed lower feed cost／body weight gain of pigs than control group. In conclusion, the results from the present study suggest that the simultaneous inclusion of phytase and carbohydrase enzyme complex to diets is advantageous with respect to reducing nutrient excretion of growing pigs and may contribute to increased economic return when added to com-soy based growing pig diets.
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