不同含水率和酶制剂对以玉米秸秆为主要纤维来源的FTMR发酵品质的影响

Effect of different moisture content and enzyme preparation on the fermentation quality of FTMR with corn straw as the main fiber source

试验研究不同含水率和酶制剂对以玉米秸秆为基础的FTMR (发酵全混合日粮)发酵品质的影响。试验选用4种外源酶制剂A、B、C、D对FTMR进行酶解处理,试验含水率分别为45%、55%和65%,调制饲粮精粗比例为4∶6 (干物质基础),每组样品3个重复,共分装36包,33℃恒温发酵5 d。结果显示,不同含水率和酶制剂对FTMR常规养分含量的影响较小。发酵过程中,随着含水率增加,各试验组pH值下降明显,总酸和乳酸含量持续上升,其中65%含水率的酶制剂A组和B组的总酸和乳酸含量优于其他组,A组葡萄糖含量先降低后升高,B组和C组乙醇含量一直处于上升趋势。发酵后各组几乎未检出大肠杆菌。研究表明,以玉米秸秆为主要纤维来源制作的FTMR最适宜发酵含水率是65%,最佳的酶制剂是酶B。

The experiment studied the effect of different moisture content and enzyme preparation on the fermentation quality of FTMR based on corn straw.Four kinds of exogenous enzyme preparations A,B,C and D were selected to treat FTMR with corn straw as the main source of fiber.The test moisture content was 45%,55%and 65%.The ratio of concentrate to coarse diet was 4∶6(dry matter basis).Three replicates of each group of samples,36 packets in total,and constant temperature fermentation at 33℃for 5 d.The results showed that different moisture content and enzyme preparation had little effect on the conventional nutrient content of FTMR.During the fermentation process,as the moisture content increased,the p H value of each test group decreased significantly,while the content of total acid and lactic acid increased continuously.The content of total acid and lactic acid in group A and B with 65%moisture content was better than that in other groups,the glucose content of group A decreased first and then increased,the ethanol content of group B and C had been on an upward trend.Escherichia coli was almost not detected.The experiment indicates that the most suitable fermentation moisture content of FTMR made from corn straw as the main fiber source is 65%,and the enzyme preparation with the best degradation effect of corn straw fiber is enzyme B.