The Effects Of Different Concentrations Of Previosly Fernmented Juice And Dehydroaceticacid On The Quality And Aerobic Stability Of Rice Straw Silage

Heilongjiang province is a predominance-area of milk industry development. But the shortage of coarse fodders, in particular the ck of high quality coarse fodders, has become to a restrictive factor for milk industry development. Therefore, it has very important meaning to explore the source of new silages. Heilongjiang province has abundant resource of rice straw, but the percent of rice straw for ruminant feeding is less than 15% and the rest are burnt. With rice harvest technology improvement, especially"the threshing before mowing"charged by Academician Jiang Yiyuan was widely used in whole province, the water content of rice straw can meet the qualification for silage. The technology of rice straw silage has obtained great success and widely applied in Japan, however the practical technology is seldom studied in China. Thus it can be seen that the study of rice straw silage technology is not only to resolve the shortage of coarse fodders, but also to effectively improve environmental pollution due to burning or inappropriate processing.Previous Fermented Juice (PFJ) and Lactic Acid Bacteria (LAB) are belongs to promoting silage additives. PFJ is a kind of new silage additive these years and LAB is a silage additive that commonly used in production. Dehydroacetate Acid (DHA), a fermentation-inhibiting additive, is mainly used in food at present and seldom reported for the application of silage. Three additives were used for silage rice straw in this test. Different concentrations of DHA were mixed with PFJ, PFJ20 and LAB and sprinkled to the rice straw, then sealed silage and compared with the blank control group. The best effect of additive combination treated on silage rice straw was selected by comprehensive consideration of these indexes such as fermentation effect and nutritional value etc. in the process of silage and after ensiling in terms of sensory characteristics and fermentation quality.The test showed that the PH value of the combination of PFJ20nd PFJ was always relative sTab., no drastic fluctuations and the numerical value was the lowest in all treatment combination. The secondary was the treatment combination of PFJ and PFJ20The effect of LABcombination is better than others combination. The content of NH₃-N was increasing tendency in the process of fermentation, but the growing tendency was slowed down while increasing the content of DHA. However the influence was remarkable for the PFJ20 and LAB combination and no significant relieved to PFJ group. According to the silage quality to grade after ensiling, the sensory characteristics of silage rice straw which treated by PFJ20,PFJ,dPFJcombination were better than other groups. The group of PFJ and PFJ20was the best in organic acid estimation, in comparison of CP content. The PFJ group and high concentration DHA group have low value of NDF and ADF.The results indicated that the fermentation accelerators (PFJ, PFJ20 and LAB) and DHA in silage rice straw can save nutrient and improve fermentation quality, restrain secondary fermentation, and enhance the silage quality observably. The good silage result can be obtained by adding only high concentration PFJ without the DHA. Indeed, the result would be better while adding the DHA. The result were also better when the low concentration PFJ20 and LAB cooperated with the DHA (0.1%,0.2%).