Effects of Supplemental Beta-mannanase on Digestible Energy and Metabolizable Energy Contents of Copra Expellers and Palm Kernel Expellers Fed to Pigs

The purpose of this study was to determine the effect of beta-mannanase supplementation on digestible energy (DE) and metabolizable energy (ME) contents of copra expellers (CE) and palm kernel expellers (PKE) fed to pigs. Six barrows with an initial body weight of 38.0 kg (standard deviation = 1.5) were randomly allotted to a 6x6 Latin square design with 6 dietary treatments and 6 periods. Six experimental diets were prepared in a 3x2 factorial treatment arrangement with 3 diets of a corn-soybean meal-based diet, a CE 30% diet, and a PIKE 30% diet and with 2 concentrations of supplemental beta-mannanase at 0 or 2,400 U/kg. All diets had the same proportion of corn:soybean meal ratio at 2.88:1. The marker-to-marker procedure was used for fecal and urine collection with 4-d adaptation and 5-d collection periods. No interactive effects were observed between diet and beta-mannanase on energy digestibility and DE and ME contents of experimental diets. However, diets containing CE or PIKE had less (p<0.05) DE and ME contents compared with the corn-soybean meal-based diet. The DE and ME contents in CE and PKE were not affected by supplemental beta-mannanase. Taken together, we failed to find the effect of beta-mannanase supplementation on energy utilization in CE and PIKE fed to pigs.