The Nutrition Of Silage Corn In Different Growth Stage And Ruminal Degradation Trend In Vitro

This study is about the biological production of the BaiDing NO.1 Silage corn at different growth stage, the change rule of the nutrition before and after the silage and the artificial rumen degradation trend. One best harvest time is expected to be found out. So the biological production, nutrition level and the developing operating rate can all reach a high level. And the whole-plant maize can be fully used. Four parts are concluded in this study: 1) the study of biological production at different growth stage of the Silage maize; 2) The nutrition change rule of the Silage maize at different growth stage; 3)the change rule of the Silage character at different growth stage; 4)The change rule of the gas production in Vitro of the silage maize at different growth stage. The result shows that:The silage maize can get a high fresh production at the stage of milky repeness. But also with the highest liquid water content, the lowest dry matter , and the nutrientsubstance cumulation is little, not suitable for the silage. Till 96-111 days, the liquid water content is between 68% and 72%, which is suitable for the silage.With the elongation of the growth stage, the CP, EE, ADL of the maize before silage is in a significant fall trend. NDF, ADL content is in a conic fall trend. Ash content is in a significant fall trend between 81-day and 86-day, a significant rise trend between 106-day and 111-day. And the WSC content is in a conic rise trend between 106-day and 111-day.With the elongation of the growth stage, the change rule of the CP, EE,NDF, ADF, ADL and Ash is nearly the same between the maize before and after the silage process. And the change before and after the silage is not significant. And the change rule of the WSC in the maize after silage is nearly the same with the maize before silage. That is rise first ,then a fall. But the change between the maize before and after the silage process is significant.