579

Asian-Aust. J. Anim. Sci. Vol. 26, No. 4 : 579-587 April 2013 http://dx.doi.org/10.5713/ajas.2012.12612

www.ajas.info pISSN 1011-2367 eISSN 1976-5517

Effects of Supplementation of -Mannanase in Corn-soybean Meal Diets on Performance and Nutrient Digestibility in Growing Pigs J. N. Lv, Y. Q. Chen, X. J. Guo, X. S. Piao, Y. H. Cao and B. Dong* Ministry of Agriculture Feed Industry Centre, State Key Laboratory of Animal Nutrition, China Agricultural University, Beijing 100193, China ABSTRACT: A total of 288 crossbred (DurocLandraceYorkshire) growing pigs were used in two experiments to investigate the effects of adding -mannanase to corn-soybean meal-based diets on pig performance and apparent total tract digestibility (ATTD). Both experiments lasted 28 d and were split into two phases namely 1 to 14 days (phase 1) and 15 to 28 days (phase 2). In Exp. 1,144 pigs weighing 23.601.59 kg BW were assigned to one of four corn-soybean meal-based diets containing 0, 200, 400 or 600 U/kg -mannanase. Increasing the level of -mannanase increased weight gain (quadratic effect; p