ケナフ(Hibiscus cannabinus L.)の乾物収量,飼料成分,タンパク質画分およびin vitro乾物消化率に及ぼす刈取法の影響

概要

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In order to examine the effect of re-growing after the first cutting on the yield, chemical composition and digestibility of kenaf as a feed for ruminants, the seeds of late maturing type kenaf (KB2) were sowed on the 24th in May and the experimental field was divided into two treatment areas. Kenaf was cut at near height of ground level and the seeds were sowed immediately after the harvesting (Treatment A). Kenaf was cut at the height of second node and re-grew thereafter (Treatment B). Thereafter, kenaf was harvested (Second cutting) immediately after the plant length was longer than 1m in treatment A and B, respectively. DM yields of kenaf were 761.4 and 679.2kg/ha at the first cutting and 323.8kg/ha and 288.3kg/ha at the second cutting in Treatment A and B, respectively. CP contents and in vitro DM disappearance rates of kenaf at the first cutting were lower than those of kenaf at the second cutting in both Treatment A and B. On the other hand, NDF and ADF contents of kenaf at the first cutting were higher than those of kenaf at the second cutting in both Treatment A and B. The results show that re-growing of kenaf after the first cutting is an effective method to obtain high quality roughage.
2010-01-15