イネツトムシ(Parnara guttata)の食害を受けたイネ(Oryza sativa)で調製したホールクロップサイレージの飼料特性

概要

論文の詳細を見る
This study was conducted to examine feed characteristics of rice plant (Oryza sativa) as whole crop silage (whole crop rice silage ; WCRS) after receiving insect damage by Straight swifts (Parnara guttata). The rice plant variety was Hoshiaoba, harvested at full-ripe stage and prepared in round baled silage with urea liquid. The ingredient digestibility and nutritive value were evaluated in four Holstein steers (average weight : 449.6±9.2 kg). Dry matter weight in 10 a of insect-damaged rice plant at the yellow-ripe stage was less than approximately 30% that of a normal rice plant of same variety (Fukagawa et al. 2004). All chemical compositions except crude protein of insect-damaged WCRS were less than those of normal WCRS in the Standard Table of Feed Composition in Japan (2009). Additionally, all ingredient digestibility of insect-damaged WCRS showed a similar tendency. Results show that total digestible nutrients and metabolizable energy of insect-damaged WCRS were, respectively, 36.5% and 5.70 MJ/kg DM, exhibiting a very low value. Results suggest that insect damage during rice plant cultivation not only decreases yield ; it also decreases all chemical compositions except crude protein, all ingredient digestibility, and all nutritive values of WCRS.
2013-04-15