Studies On The Laws Of The Quality Change Of Moldy Soybean Meal

In this experiment, three group of Soybean meal with different moisture (13.89%, 15.77%, 17.66%) were used, to study the changes of molds, water content(WC), ether extract(EE), crude protein(CP), protein solubility(PS) and urease activity(UA) of soybean meal, and the relationship of the mould growth and WC, EE, CP, PS, U A of soybean meal. The article consists of two parts. Part 1: The experiment of moldy growthAbove 75% moisture, the Soybean meal were allotted to twelve treatments assigned in a 3 4 factorial arrangement of three moisture level (13.89%,15.77%,17.66%) and four temperature level(20 1 ,25 1 , 30 1 , 35 1 ) , the relationship of mould and storage time , temperature , moisture of Soybean meal were investigated. The results showed: When the time was going on, the molds of soybean meal were increasing. The relationship of the quantity increasement of the molds and the storage time was non-linear regression (p<0. 05) ; As the molds of soybean meal were increasing, the WC was increased. The relationship of the WC increasement and the quantity increasement of the molds was linear regression (p<0. 05); The suitable temperature of the moldy growth was from 20 to 35 . 17.66% moisture level had a significantly influenced on the molds change (p<0. 05) . Part 2:Study on the quality of moldy Soybean mealAbove 75% moisture, the Soybean meal were allotted to twelve treatments assigned in a 3 4 factorial arrangement of three moisture level(13.89%,15.77%,17.66%) and four temperature level(20 1 ,25 1 , 30 1 , 35 1 ) , It was measured and analyzed that the changes of molds ., water content(WC), ether extract(EE), crude protein(CP), protein solubility(PS) and urease activity(UA) of soybean meal. The result showed: As the molds of soybean meal was increasing, the PS were decreased. The relationship of the quantity of the molds and the PS reduce was linear regression (p<0. 05); As the molds of soybean meal was increasing, EE were decreased. The relationship of the quantity of the molds and the EE reduce was non-linear regression (p<0. 05); As the molds of soybean meal were increasing, the UA and CP were not significantly different (p>0. 1) .In a conclusion, the quality of soybean meal was decreased as the molds growing ,and the relationship of the quantity of molds and the PS , EE reduce, the WC increasement of Soybean meal were linear regression respectively(P<0.05).