Abstract

An experiment was conducted to investigate the effects of microbial phytase (Natuphos ® ) supplementation in combination with carbohydrases (composed of enzymes targeted to soybean meal (SBM) dietary components such as α-galactosides and galactomannans; Endo-Power ® ) to corn-soybean meal based diet (CSD) and complex diet (CD) with a partial replacement of SBM with rape seed meal (RSM) and cotton seed meal (CSM) on growth performance and nutrient digestibility of growing pigs. A total of 168 growing pigs averaging 13.18±1.77 kg of initial body weight was arranged as a 2×2 factorial design with main effects of diet types (corn-SBM based diet (CSD) and complex diets (CD; 5% of SBM was replaced with 2.5% of RSM and 2.5% of CSM in diet for phase I (0 to 3 weeks) and 6% of SBM was replaced with 3% of RSM and 3% of CSM in diet for phase II (4 to 7 weeks))) and enzyme supplementation (none and 0.1% of phytase (500 FTU/kg diet) and 0.1% of carbohydrases). The diet with enzyme application were formulated to have a 0.18% unit lower aP than diets without enzyme application. Each treatment had three replicates with 14 pigs per replicate. To determine supplementation effect of phytase and carbohydrases on ileal amino acid digestibility of SBM, RSM and CSM, a total of 18 T-cannulated pigs (initial body weight; 13.52±1.24kg) were assigned to six dietary treatments in the present study. Dietary treatments in metabolic trial included 1) SBM diet, 2) SBM diet+with enzymes (phytase (500 FTU/kg) and carbohydrases at 0.1%, respectively), 3) CSM diet, 4) CSM diet+enzymes, 5) RSM diet and 6) RSM diet+enzymes. During whole experimental period (0 to 7 wks), there was no difference in growth performance between diets (CSD and CD). However, dietary phytase and carbohydrases supplementation significantly improved gain/feed ratio (G:F) of growing pigs. During the phase II (4-7 weeks), dietary phytase and carbohydrases supplementation significantly improved all fecal nutrient digestibilities (Dry matter (DM), gross energy (GE), crude protein (CP), crude fat (CF), calcium (Ca) and phosphorus (P)). Dietary phytase and carbohydrases supplementation improved significantly overall ileal amino acid digestibilities of SBM, RSM and CSM based diets (p<0.05). The simultaneous inclusion of phytase and carbohydrases in both of CSD and CD reduced feed cost per kg body weight gain (FCG). Also, results suggest that 2.5 to 3% of RSM and CSM, respectively, might be used as a protein source in growing pig diets without having an adverse effect on the growth performance and nutrient digestibility and simultaneous phytase and carbohydrases addition improves nutritional value of SBM, RSM and CSM by improving ileal amino acid digestibilities. (Asian-Aust. J. Anim. Sci. 2003. Vol 16, No. 9 : 1339-1347)

Highlights

  • The concept of using enzyme products as animal feed additives has attracted considerable interest within the feed industry as a means for improving performance, lowering supplemental nutrient requirement, and lowering potential for environmental pollution from manure.Microbial phytase is one of the most commonly used enzymes in monogastric animal diets

  • It is expected that supplementation of simultaneous phytase and carbohydrases targeted to corn-Soybean meal (SBM) based diets will improve growth performance and nutrient utilization of pigs by degradation of anti-nutritional factors (ANFs) such as phytate, α-galactosides, galactomannans and non starch polysaccharides (NSP)

  • Experiment was arranged as a 2×2 factorial design with main effects of diet types (corn-soy bean meal based diet (CSD) or complex diets

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Summary

Introduction

The concept of using enzyme products as animal feed additives has attracted considerable interest within the feed industry as a means for improving performance, lowering supplemental nutrient requirement, and lowering potential for environmental pollution from manure.Microbial phytase is one of the most commonly used enzymes in monogastric animal diets. Dietary phytase and carbohydrases supplementation improved significantly overall ileal amino acid digestibilities of SBM, RSM and CSM based diets (p

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