Abstract
AbstractWe evaluated soybean (Glycine max (L.) Merr. cv. Ryuho) silage that was harvested at two growth stages by the direct cutting system used for corn‐silage production. R6 (full‐size green beans) and R7 (pods and 50% of leaves yellowed) growth stages of grain‐type soybean were compared after being harvested with a corn harvester and ensiled with a round baler for chopped material. Dry matter (DM), crude protein (CP) and acid detergent fiber contents were higher for R7 silage than for R6 silage. The silage of both stages exhibited lactic‐acid dominant fermentation, with no significant difference in ruminal effective DM degradability. R6 silage had higher volatile basic nitrogen in total nitrogen (P < 0.01) and a higher ruminal soluble CP fraction (P < 0.01) than R7 silage. In conclusion, although well‐preserved silage was obtained from harvesting soybean at both R6 and R7 stages using the direct cutting system, R7 stage harvesting appeared to result in better conservation of protein quality.
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