Nutrient content and protein and energy digestibilities of ethanol-extracted, low alpha-galactoside soybean meal as compared to intact soybean meal
1999
Leske, K.L. | Coon, C.N.
A study was conducted with adult Leghorn roosters to determine TME(n), dry matter digestibility, amino acid content and digestibility, and cellulose and hemicellulose content and digestibility of ethanol-extracted, low alpha-galactoside soybean meal (SBM). Results were compared to that of commercially available 47% CP SBM. Twenty-one roosters were utilized; seven roosters were precision-fed each of the two soybean meal treatments, and seven served as feed-deprived controls. Excreta were collected for 48 h after feeding. A second experiment compared the TME(n), as determined with roosters, to AME(n), as determined with male broiler chicks, of 44% and 47% CP SBM and three different ethanol extraction procedures to remove alpha-galactosides. The ethanol extraction procedure concentrated CP, gross energy, and TME(n). Dry matter digestibility of SBM increased from 52.1% (control SBM) to 63.3% (ethanol-extracted SBM) because of the ethanol extraction procedure. The average amino acid digestibility of ethanol-extracted SBM was 91.6%, compared to 88.0% for control SBM. The digestibility of methionine, alanine, valine, and lysine was improved by the ethanol extraction procedure. Total cellulose and hemicellulose digestion, measured as digestion of specific monosaccharide components, was increased by the ethanol extraction. The TME(n) and AME(n) values for the different control and extracted SBM were similar. These data indicate that the ethanol extraction of SBM to remove alpha-galactosides resulted in a product that is more protein and energy dense than commercial SBM. Advantages in digestion of amino acids and fiber may contribute to the increase in TME(n) observed in both young and adult birds.
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