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

W B Kwon,B G Kim

doi:10.5713/ajas.15.0275

Abstract

The purpose of this study was to determine the effect of β-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 6×6 Latin square design with 6 dietary treatments and 6 periods. Six experimental diets were prepared in a 3×2 factorial treatment arrangement with 3 diets of a corn-soybean meal-based diet, a CE 30% diet, and a PKE 30% diet and with 2 concentrations of supplemental β-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 β-mannanase on energy digestibility and DE and ME contents of experimental diets. However, diets containing CE or PKE 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 β-mannanase. Taken together, we failed to find the effect of β-mannanase supplementation on energy utilization in CE and PKE fed to pigs.

Highlights

Sharp increases in the prices of traditional feedstuffs such as corn and soybean meal (SBM) have feed producers seeking alternatives to traditional feed ingredients in swine diets
The interactive effect between diet and β-mannanase was not observed in energy digestibility, digestible energy (DE) and metabolizable energy (ME) values of the experimental diets (Table 3)
Despite that the experimental diets had a large quantity of substrates for the β-mannanase and considerably high dose of enzyme supplementation (2,400 U/kg), we failed to find the effects of β-mannanase supplementation on the energy digestibility of experimental diets

Summary

Introduction

Sharp increases in the prices of traditional feedstuffs such as corn and soybean meal (SBM) have feed producers seeking alternatives to traditional feed ingredients in swine diets. Copra expellers (CE) and palm kernel expellers (PKE), co-products from vegetable oil industry, are produced by the mechanical oil extraction from dried coconut kernels and palm nut kernels, respectively (Son et al, 2012; Sulabo et al, 2013). These co-products can be good candidates for alternative feedstuffs because of the relatively low price and fairly good nutrient composition compared with corn and SBM (Agunbiade et al, 1999; Kim et al, 2001). Previous studies have shown that utilization of carbohydrates and protein retention were hindered by mannan in swine diets (Kratzer et al, 1964; Rainbird et al, 1984)

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