Study On The Improvement Of Soybean Meal Ferment Process Technology And Effects On Growth Performance In Piglets

In order to remove the anti-nutrition-factors and highten the degradation performance of protein in the soybean meal, several trials were conducted to choose proper strain and improve the ferment process. Seven aerobic microorganism strains and four lactic acid bacteria strains were selected and proved effective. The activities of protease and the content of ASP, AA-N, and TA of ferment substance (FM) were determined. The formula of fermentation was determined primarily. It was also confirmed that "two-step ferment process" was better than "one-step ferment process" in decomposing protein into peptide and amino acids. The nutritional characteristics and effects of fermented soybean meal on growth performance, immune and digestive function of piglets was determined.The results of the fermentation experiment showed that more than10%addition rate of bran could promote the growth of microorganism significantly during the fermentation of soybean meal. The degradation efficiencies of Aspergillus oryzae MQ11.7was better while material and water ratio was5:3. The ANP, content of AA-N and ASP, and RR of the FM is821u/g,0.94%,8.03%, and97.13%, respectively. Although Bacillus strains could degrade soybean protein betterly, the ferment substance was too sticky to be further processed. Besides, the RR of the FM was only80.69%. Aspergillus oryzae MQ11.7produced most lactic acid while material and water ratio was5:4. The RR and the content of TA of the FM was5.33%and99.02%, respectively. It was confirmed that Aspergillus oryzae MQ11.7and Lactobacillus fermenti FL18were the best strains in two-step ferment process. The content of TA, AA-N and ASP, and RR of the FM is5.94%,2.47%,20.43%, and87.37%, respectively. And the Aspergillus oryzae MQ11.7decreased most of the antigenic protein of soybean. Ten percent of FM was added to piglets feed, compared with the control, the experimental group was15.8%higher on ADG,6.9%higher on daily feed intake, and7.4%lower on F/G. The DR of experimental group were significantly lower than control group. In addition, the activities of protease in duodenum, jejunum, and ileum content of experimental piglets and L/E in colon were significantly higher than those of control piglets.Our results suggest that Aspergillus oryzae MQ11.7ferment substance had the merits of quick, high recovery, and low content of antigenic protein. And two-step ferment process could significantly improve the quality of FM. However, compared with "one-step ferment process", the cost of "two-step ferment process" was higher.