飼料資源としてのアカウキクサ(Azolla)の栽培条件と栄養価値  [in Japanese] Cultivation Condition and Nutritive Value of Azolla as a Feed Resource.  [in Japanese]

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Abstract

南九州における水生シダ植物アゾラ(Azolla, 日本名アカウキクサ)の飼料化を確立するため, pH, 生育時期およびアイガモ放飼がアゾラの生育に及ぼす影響を検討するとともに, 化学成分, 家鴨による嗜好性およびその給与が家鴨の産肉性に及ぼす影響を検討した。 pH2.8〜9.2の各培養液による生育について, pH5.5〜8.5でのA. japonicaの生育には差がみられなかった。4月上旬および5月下旬にそれぞれ室外環境で接種した A. pinnata 103, A. filiculoides 1006, A. caroliniana 3004, A. microphylla 4018, A. japonicaの生育については, 接種後1〜2週月の生育はいずれの種においても5月(平均気温21.4℃)に比べ4月(平均気温14.6℃)で遅かった。接種後5週間の増殖量についてアゾラ種間で差がみられなかったものの(p>0.05), A. filicloides 1006と在来種のA. japonicaの生育がやや速い傾向を示した。田植え後の水田に接種したアゾラはアイガモ放飼区および無放飼区とも生育が遮光により低下し, 接種後40日間の新鮮物収量は約2.000kg/10aであったが, アイガモ放飼区では虫害, 赤変, 過繁茂あるいはカビなどが発生しなかった。 上述5種アソラ混合物の粗タンパク質舎量は乾物当たり25.1%であり, 家鴨による嗜好性については, ヨモギ(Arzemisia vulgaris L.), シロクローバー(Trifolium repens L.), カラスノエンドウ(Vicia angustifolia L.), エゾノギシギシ(Rumex obtusifolius L.), イタリアンライグラス(Lolium multiflorum Lam.)およびキャベツ(Brassica oleracea var.)に比べ, アゾラの新鮮物摂取量が有意に高かった(p<0.01)。アゾラと配合飼料を家鴨雛に給与した場合, 2〜8週齢の体重は対照区に比べ有意に大きかった(p<0.05)。飼料要求率は4適齢まで対照区よりも低かったが, その後, 増大する傾向が認められた。以上から, アソラ新鮮物は家鴨による嗜好性が高く, その給与が発育を促進するとともに, 産肉性にも良好な成績をもたらすことが示唆された。

The present study was examined to utilize the aquatic fern Azolla species as a feed resource effectively in southern Kyushu. The influence of culture solution pH, growing season, introduction of ducks on multiplication of Azolla, chemical composition and palatability of Azolla for ducks, and the effect of Azolla feeding on meat production were investigated. The results obtained were as follow : An experiment using culture solution of pH2.8-9.2 indicated that the A. japonica had a similar pattern of growth rate in each level of pH 5.5-8.5. Five Azolla species i.e. ; A. pinnata 103, A. filiculoides 1006, A. caroliniana 3004, A. microphylla 4018, and A. japonica showed a slower growth during 1-2 weeks after inoculation in April (mean air temp. 14.6℃) than in May (mean air temp. 21.4℃) 1996. Though there was no significant difference of growth during 0-5 weeks after inoculation among the 5 species, A. filiculoides 1606 and A. japonica tended to grow rapidly to some extent. The biomass of Azolla mixture inoculated in the paddy field (with free-ranged ducks and without ducks) was not over 2000 kg/10 a during 0-40 days due to furrow shading in the paddy field after rice transplanting. However, pest injuries, reddening, over-luxuriant growth, and moulds were not found in plants in the paddy field with ducks. The Azolla mixture contained 25.1% crude protein on DMbasis. The palatability (FWbasis) of A. japonica for ducks was significantly higher than those of Artemisia vulgaris L., Trifolium repens L., Vicia angustifolia L., Rumex obtusifolias L., Lolium multiflorum Lam. and Brassica oleracea var. (p<0.01). Duckling fed with Azolla mixture along with formula feed, had significantly greater growth rates during 2-8 weeks of age than those fed with formula feed only. The feed conversion of the former was lower during 6-4 weeks of age than the latter, however, it tended to be higher afterwards. These findings suggested that Azolla had higher palatability (FWbasis) for the ducks, and also its supplementation to the animals resulted in better meat production as well as faster growth.

Journal

  • Japanese Journal of Grassland Science

    Japanese Journal of Grassland Science 44(3), 266-271, 1998

    Japanese Society of Grassland Science

References:  11

Cited by:  1

Codes

  • NII Article ID (NAID)
    110003850328
  • NII NACSIS-CAT ID (NCID)
    AN00194108
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0447-5933
  • NDL Article ID
    4613828
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産) // ZR22(科学技術--農林水産--畜産)
  • NDL Call No.
    Z18-344
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE 
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