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The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus >
No.41 (1994/12) >

Title :亜熱帯野草地における黒毛和種育成牛の成長と光エネルギー利用効率(生物生産学科)
Title alternative :Growth of growing Japaness black cattle and efficiency for solar energy utilization on natural pasture of the subtropics (Department of Bioproduction)
Authors :平川, 守彦
日越, 博信
大城, 政一
糸満, 裕
平山, 一浩
Authors alternative :Hirakawa, Morihiko
Higoshi, Hironobu
Oshiro, Seiichi
Itoman, Yutaka
Hirayama, Kazuhiro
Issue Date :1-Dec-1994
Abstract :本研究は亜熱帯地域の野草地における植生の季節的変化や乾物生産および太陽エネルギーから放牧牛の増体蓄積エネルギーまでのエネルギーの流れを調べるために行った。その結果, 野草地ではどの時期においてもススキ(Miscanthus sinensis Anderss)とセンダングサ(Bidens pilosa L.F. decumbens Scherff)が優占し, 入牧時の現存量は2期目を除き432∿564g/m^2の範囲であった。放牧期間中の採食量は平均して332g/m^2であり, 日増体重は2期目に最高値0.88kgを示した。野草地における年間の光エネルギー利用効率は植物蓄積エネルギーで0.499%, 摂取エネルギーで0.545%, 可消化エネルギーで0.225%, 代謝エネルギーで0.185%, 増体蓄積エネルギーで0.008%であった。以上のことから可消化エネルギーと増体蓄積エネルギーの段階において光エネルギーの利用効率が寒地型牧草や暖地型牧草の放牧草地と比べ低いことがわかった。
This study was conducted to investigate seasonal variation of the vegetation and dry matter production of natural grasses, and estimate the energy flow from solar radiant energy to retained energy of growing Japanese black cattle on natural pasture of the subtropics in Japan. The results obtained are as follows. This natural pasture was nearly dominated by Miscanthus sinensis Anderss and Bidens pilosa L. F. decumbens Scheff throughout grazing periods. The herbage mass when the time steers were started grazing in this pasture without second period ranged 432g/m^2 to 564g/m^2. An average value of herbage intake by cattle was 332g/m^2 in all grazing periods. Maximum daily gain of 0.88kg was shown at second grazing period. Each efficiency for solar energy utilization in plant fixed energy, intake energy, digestible energy, metabolic energy and retained energy were 0.499%, 0.545%, 0.225%, 0.185% and 0.008%, respectively throughout the year on natural grazing pasture. From the facts described above, we found the efficiency for solar energy utilization in digestible energy and retained energy on natural pasture was lower than on cool-season grass and warm-season grass pasture.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3759
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.41 p.139 -145
Appears in Collections:No.41 (1994/12)

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