Evaluation of the Protein Quality of Soybean Meals from Different Sources in Broiler Chicks Fed with Semi-Purified Diets
Carmencita D. Mateo* and Jay Ronel V. Conejos
Animal and Dairy Sciences Cluster, College of Agriculture
University of the Philippines Los Baños, College, Laguna Philippines 4031
*This email address is being protected from spambots. You need JavaScript enabled to view it.
ABSTRACT
Two experiments (EXP) were conducted to evaluate the protein quality of dehulled soybean meal (SBM) from the US (United States), Argentina, Brazil, Malaysia, and Philippines, and a non-dehulled SBM from India using chemical and bioassay techniques in 320 male Ross broiler chicks fed with a semi-purified diet for 10 days based on corn-starch-dextrose-soy oil calculated to contain 3,200 kcal/kg metabolizable energy, 13.9% crude protein, 0.9% lysine, 0.2% methionine, and 0.4% methionine and cystine. Chemical analysis of SBM in experiment 1 showed that SBM from the US and Malaysia had lower crude fiber contents than the SBM from Argentina and Brazil. Good SBM processing was shown by Malaysia SBM with the highest protein solubility of 83% while poor processing was shown by Brazil SBM with the lowest protein solubility tests of 67% relative to SBM from US (79%) and Argentine (78%). Weight gain, feed:gain, and protein efficiency ratio (PER) of chicks fed the high efficiency SBM from Malaysia were significantly higher than those fed with SBM from US, Argentina, and Brazil. Chicks fed with the poor quality overtoasted SBM from Brazil had significantly low PER compared with those birds fed with the SBMs from the US, Malaysia and Argentina. In experiment 2, weight gain, feed:gain and PER were significantly lower in birds fed with the non-dehulled Indian SBM than those fed with the US or Philippine SBM. In both EXP, the addition of 0.2% DL-methionine to the diet significantly improved the weight gain, feed:gain, and PER of birds. Short term feeding studies in conjunction with chemical assays can serve as sensitive indicators to detect differences in protein quality of SBM from different sources....
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