Seasonal Changes in Productivity and Quality of Temperate Grasses and the Fluctuations with Years. : 2. Changes of estimated dry matter digestibility

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  • 寒地型イネ科草種の生産性と品質の季節的変化とその年次変動 : 2. 推定乾物消化率の変化
  • カンチガタ イネカ ソウシュ ノ セイサンセイ ト ヒンシツ ノ キセツテキ

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Abstract

Seasonal changes of estimated dry matter digestibility of 6 temperate grasses were compared and relationship between the digestibility and meteorological elements was investigated. Lolium perenne, Dactylis glomerata, Festuca arundinacea, Agrostis alba, Festuca rubra and Poa pratensis were sown in 1984, and the digestibility was investigated from 1985 to 1989 under frequent cutting based on the pattern derived by an overlapping sequence of 3-weekly cuts. The digestibility was estimated from a linear regression equation showing relation between the digestibility and disappearance rate by the two-stage neutral detergent-cellulase technique. Mean values of digestibility for 5 years were high in early spring, declined gradually toward summer with or without troughs on the way, and recovered well toward late autumn thereafter. It seemed that the seasonal changes of digestibility were always affected by average air temperature for all grasses, affected by precipitation especially for the 1st and 2nd harvest years, and the stage of internode elongation also brought some effects to Dactylis and Festuca. The highest mean percentage digestibility for 5 years was 77% in Lolium, followed by 70% in Dactylis, 69% in Festuca arundinacea, 67% in Agrostis and Festuca rubra, and 56% in Poa. And the highest digestible dry matter yield was obtained in Lolium.

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