Use of fermented soybean meal with Bacillus subtilis TJ-C9 in nursery pigs diets
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The utilization of fermented soybean meal (FSBM) with B. subtilis TJ-C9 in nursery-pigs diet, was assessed in this study. Changing of nutritional composition and the anti-nutritive factors (ANFs) content, as well as the nutrients utilization in weaning pigs were investigated. Fermentation with B. subtilis TJ-C9 increased the concentration of crude protein, ether extract and gross energy in soybean meal (SBM) by 3.50, 13.59 and 8.77%, respectively, compared with the unfermented SBM. Moreover, the contents of trypsin inhibitors, β-conglycinin, stachyose and raffinose were clearly decreased by 81.82, 36.13, 80.00 and 99.93%, respectively. The reduction of ANFs led to the improvement of the protein digestibility from 73.86 to 78.56% and the metabolizable energy (ME) from 3,237 to 3,562 kcal/kg. Furthermore, the effects of replacing dietary different protein sources with FSBM on growth performances of nursery pigs were also studied. A total of 420 piglets aged 4 weeks was divided into five groups and six replicates with 14 pigs per each, which was randomly fed one of these experimental diets; a control diet based on soy protein (SBM and extruded soybean), fish meal and enzyme-treated SBM (diet 1), replacing protein sources in control diet with FSBM; soy proteins(diet 2), 50% fish meal (diet 3), 100% fish meal (diet 4) and enzyme-treated SBM (diet 5), respectively. Results showed that the growth performances in term of the average daily gain, average feed intake and the feed conversion ratio of piglets in period 5-9 weeks of age were not significantly different among groups. However, replacement of FSBM for soy protein provided the better feed conversion ratio by 5.3%. In conclusion, fermentation of soybean meal with B. subtilis TJ-C9 improved the nutritional quality of SBM and therefore, fermented SBM can be used as high quality protein source in nursery pigs diet.
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