The potential for the improvement of the nutritive value of soya-bean mean by different proteases in broiler chicks and broiler cockerels

S. Ghazi, Hugh Galbraith, M. R. Bedford

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Abstract

1. The potential for improving the nutritive value of commercial solvent-extracted, heat-treated soya-bean meal (SBM) by protease treatment was measured using growing broiler chicks and tube-fed broiler cockerels.

2. SBM was pre-treated (50degreesC for 2 h) with water alone; at alkaline pH (initial pH 8.25) with and without protease P1 (isolated from a Bacillus species) or at acid pH (initial pH 4.5) with and without protease P2 (isolated from an Aspergillus species) and incorporated into diets (290 g SBM/kg diet) for broiler chicks (20 chicks/treatment). Only protease P2 treatment improved chick performance; from 7 to 28 d of age, chicks fed on treated SBM had greater feed intakes and gained more weight than chicks fed on untreated SBM. Both proteases P1 and P2 significantly reduced chick serum anti-soya antibodies while protease P2 treatment increased apparent ileal nitrogen (N) digestibility and apparent N retention across the whole digestive tract.

3. Two tube-feeding experiments established that, of the treated SBMs used in experiment 1, only protease P2 treatment improved apparent N digestibility and true metabolisable energy. Also it was shown that increasing the temperature at which treated SBM was dried to 60degreesC, compared with freeze-drying or drying at 50degreesC reduced apparent N digestibility and true metabolisable energy of SBM with no significant interactions between enzyme treatment and drying temperature for both apparent N digestibility and TME.

4. It is concluded that, overall, the nutritional value of SBM assayed in a growth trial and by tube feeding was improved by treatment with protease P2 and not by treatment with protease P1.

Original languageEnglish
Pages (from-to)70-78
Number of pages8
JournalBritish Poultry Science
Volume43
Issue number1
DOIs
Publication statusPublished - 2002

Keywords

  • TREATED SOYBEAN-MEAL
  • PIGS FED DIETS
  • ENZYME SUPPLEMENTATION
  • GROWTH-PERFORMANCE
  • ILEAL DIGESTIBILITIES
  • METABOLIZABLE ENERGY
  • LUPINUS-ALBUS
  • AMINO-ACIDS
  • TRUE

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