Study On The Effects Of Additives On Baled Silage Quality Of Oat

Oat is an important feedstuff source in Qinghai-Tibet plateau. The study on oatsilage can improve the development of feeding forage modulation technology forlivestock feeding in winter and spring. In order to study the effects of differentmoisture contents, additives and ensiling time on the quality of baling oat silage, a2×5experiment was designed in Xiahe County, Gannan Tibet Autonomous Prefecture.Baling oat harvested at filling stage was wilted to two targeted moisture contents andtreated with(1)corn flour(4%);(2)urea(0.4%);(3)Synlac Dry(0.0002%);(4)Sila-Max200(0.00025%);(5)direct baling without additives(CK). For the sake of developingthe best baling oat silage measures, the parameters of nutrition and fermentation,microbial counts and community analysis were undertaken. The main results of thisstudy are as follows:(1) Moisture content of oat significantly affected all of the parameters tested.Comparing to A1(45%-50%), the silage under A2(65%-70%) had higher content of CP,LA; lower NDF, ADF as well as the count of M&Y and Bac. Under the highermoisture content, except adding urea, NH3-N was kept at a lower level, WSC changedlittle over time. Thus, the moisture content of65%-70%was batter for oat silage.(2) As a nutrient additive, corn flour could significantly increase the content ofWSC in oat silage; a significant decrease in NDF and ADF and a substantial increasein LA were also observed, so improved oat silage quality.(3) Oat silage under urea treatment had higher content of CP and NH3-N.Compared with NDF, its effects on ADF was more significant. Although the ureatreatment helped to increase the count of LAB, the content of LA did not increaseremarkably and kept at a low level. To sum up, adding urea could not significantlyimprove the oat silage quality.(4) Synlac and Sila-Max200Dry could significantly reduce the content of NDFand ADF oat silage, meanwhile increase the number of LAB and the content ofLA,and strongly inhibit M&Y and Bac. Sila-Max200could also improve the stability of CP and WSC in oat silage. And even after120days, it can still keep LA at1.13%and NH3-N at13.38%, so giving the best performance.(5) In high altitude area of Gannan, it took longer time than40d to achieve stablestage of baling oat silage in Autumn. The best quality was observed at80d. After120d,oat silage quality began to decline, LAB count decreased and M&Yand Bac increased(6) In conclusion, silage additives had significant effects on improvement of oatsilage quality; biological additives were more effective than non-bio ones, Sila-Max200had the optimal performance. For wrapped oat silage, cutting at filling stage,baling at65%-70%moisture content with Sila-Max200could achieve high quality.