Characterizing the feeding value of extruded-expelled soybean meal with or without added fat in a commercial swine production facility (2000)

M J Webster,Robert D Goodband,La Llata M De,J C Woodworth,Michael D Tokach,Jim L Nelssen,Steven S Dritz,N Said

doi:10.4148/2378-5977.6670

Abstract

A total of 1,200 gilts was used to evaluate the effects of replacing conventionally processed soybean meal with extruded-expelled soybean meal on finishing pig growth performance. Dietary treatments were arranged in a 2 Ã— 3 factorial with two sources of soybean meal (solvent-extracted or extruded-expelled) and three levels of added fat (none, 3.4, and 7% in Phase 1 than decreasing in subsequent phases). Energy levels were adjusted such that the higher energy in extruded-expelled soybean meal (with or without added fat) was equal to that provided by solvent-extracted soybean meal with added fat. From 54 to 135 lb, pigs fed extruded-expelled soybean meal had improved ADG and F/G compared to those fed solvent-extracted soybean meal. Increasing added fat in either extruded-expelled- or solvent-extracted soybean meal-based diets linearly improved ADG and F/G. From 135 to 270 lb, pigs fed extruded-expelled soybean meal and(or) increasing added fat had decreased feed intake. For the overall growing-finishing period, ADG was unaffected by increasing energy density. However, ADFI was decreased and F/G improved as energy density of the diet was increased either with extruded-expelled soybean meal and(or) added fat. Carcass leanness was not affected by dietary treatment. These results indicate that increasing the energy density of the diet by using extruded-expelled soybean meal and(or) added fat improves feed efficiency in finishing pigs reared in a commercial environment.; Swine Day, Manhattan, KS, November 16, 2000

Highlights

The ileal amino acid digestibility and metabolizable energy (ME) of extrudedexpelled soybean meal were established in a previous KSU study
Energy levels were adjusted such that the higher energy in extruded-expelled soybean meal was equal to that provided by solvent-extracted soybean meal with added fat
ADFI was decreased and F/G improved as energy density of the diet was increased either with extruded-expelled soybean meal and(or) added fat

Summary

Introduction

The ileal amino acid digestibility and metabolizable energy (ME) of extrudedexpelled soybean meal were established in a previous KSU study. Recent research at KSU indicated a linear improvement in feed efficiency through the growing and finishing phases with increasing additions of fat (0 to 6% choice white grease) in diets. The improvements in ADG were not the same throughout the finishing phase. During the growing phase (80 to 130 lb) when the pigs were in an energy dependant phase of growth, increasing added dietary fat linearly increased growth rate. Each 1% added fat improved ADG approximately 2%. During the late finishing phase (210 to 260 lb), added fat had no effect on ADG, but F/G continued to be improved. The economic value of added dietary fat for improv-

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