Study on three processing methods of different corn varieties.

The effects of variety and processing method on feeding values of corn(Zea mays L.) were studied.The corn varieties of Zhongyuandan32,Nongda86,Nongda95,Nongda108,and NongdaGaoyou115 were harvested at dough stage and then processed for 45 d as whole-crop silage,stover only silage,or stover stack,respectively.The analytic results of samples indicate that the pH of the whole-crop corn silage was significantly lower than that of stover silage(P0.05),and the lactic acid content was significantly higher(except for Nongda 86)(P0.05).The CP content of the whole-crop corn silage was significantly higher than that of stover silage(P0.05),and the NDF and ADF contents were lower.This inferred that the fermentative quality and nutrient contents of whole-crop corn silage were better than those of stover silage.The CP content of stover stack varied among varieties,and the NDF and ADF contents of stover stack were higher than those of silages.This inferred the lower nutrient quality of stover stack.The CP content of whole-crop corn silage of Zhongyuandan32 were significantly higher than that of others(P0.05),and the fiber content of which was moderate.In general,the whole-crop corn silage had better feeding values and the Zhongyuandan32 performed better than others.