Combination of phytase and beta-mannanase supplementation on energy and nutrient digestibility in pig diets containing palm kernel expellers

摘要

The present study was conducted to investigate the effects of supplemental phytase and beta-mannanase on apparent total tract digestibility (ATTD) of nutrients in corn-soybean meal-based diets containing 100 g/kg palm kernel expellers (PKE) fed to two different breeds of growing pigs. Four purebred Duroc boars and four crossbred barrows with an initial body weight of 74.7 kg (standard deviation = 12.4) were randomly allotted to each single 4x4 Latin square design with four diets and our periods. Four experimental diets were prepared in a 2x2 factorial arrangement with two supplemental levels of phytase at 0 or 500 phytase units/kg and two supplemental levels of beta-mannanase at 0 or 800 units/kg. All diets were based on corn, soybean meal, and PKE without inorganic P sources. Each period consisted of 4-d adaptation period and 4 d of total collection of feces. There was no phytasex beta-mannanase interaction for the digestibility of nutrients and energy. Phytase supplementation improved the ATTD of P and ash (P0.05), while beta-mannanase had no effect on the ATTD of nutrients in the experimental diets. Purebred Duroc boars had higher ATTD of Ca, P, and ash than crossbred barrows (P0.01). The metabolizable energy:gross energy was higher in the purebred Duroc boars compared with the crossbred barrows, but digestible energy:gross energy did not differ between the two breeds. The combination of phytase and beta-mannanase supplementation to diets containing PKE did not have any interactive effects on ATTD of nutrients and energy in growing pigs. (C) 2015 Elsevier B.V. All rights reserved.