The Effect of Various Inclusion Levels of Î²-Mannanase on Nutrient Digestibility in Diets Consisting of Corn, Soybean Meal and Palm Kernel Expellers Fed to Growing Pigs

W B Kwon,B G Kim,S K Park

doi:10.3844/ajavsp.2015.9.13

Abstract

An experiment was conducted to determine the effects of various inclusion levels of I²-mannanase on the energy and mannan digestibility in diets containing corn, Soybean Meal (SBM) and Palm Kernel Expellers (PKE) fed to growing pigs. The PKE contained 92.6% dry matter, 4,417 kcal gross energy kg-1, 4.02% ash and 31.3% mannan on an as-fed basis. Six barrows with an initial body weight of 41.4Â±1.7 kg were individually housed in metabolism crates equipped with a feeder and a nipple drinker. Pigs were randomly allotted to a 6A6 Latin square design with 6 dietary treatments and 6 periods. An experimental period consisted of a 4-d adaptation period and a 5-d collection period. Pigs were fed corn-SBM-based diets containing 15% PKE with 0, 400, 800, 1,600, 2,400 or 3,200 U kg-1 of I²-mannanase. A chromic oxide was added as an indigestible marker for fecal collection according to a marker-to-marker procedure. Urine was also collected from each period. Each of the 6 diets contained 3.60, 3.91, 4.06, 2.57, 3.57 and 2.59% of mannan, respectively. No linear and quadratic effects of I²-mannanase supplementation on apparent total tract digestibility of energy were observed. The digestibility of mannan was also not affected by the increasing level of I²-mannanase supplementation. In conclusion, exogenous I²-mannanase did not affect the energy and mannan digestibility in corn-SBM-based diets containing 15% of PKE fed to growing pigs.

Highlights

Dietary mannan, one of Non-Starch Polysaccharides (NSP), has negative effects on swine performance (Rainbird et al, 1984)
Studies have been reported that βmannanase supplementation to corn-Soybean Meal (SBM)-based diets affects nutrient digestibility and growth performance in pigs (Pettey et al, 2002; Lv et al, 2013)
No diffferences were observed for the mannan digestibility among the various inclusion levels of βmannanase in the experimental diets (Table 4)

Summary

Introduction

One of Non-Starch Polysaccharides (NSP), has negative effects on swine performance (Rainbird et al, 1984). Studies have been reported that βmannanase supplementation to corn-Soybean Meal (SBM)-based diets affects nutrient digestibility and growth performance in pigs (Pettey et al, 2002; Lv et al, 2013). Palm Kernel Expellers (PKE) has recently received great attention because of the low price compared with other ingredients (Kim et al, 2001; Fang et al, 2007; Son et al, 2012). The content of mannan in PKE was much greater than that in other ingredients widely used for swine diets (Table 1; Mok et al, 2013). Dry matter Crude protein Ether extract Ash Ingredient Corn SBM PKE.

Methods

Results

Conclusion