Herbage Yield, Chemical Composition and In vitro Dry Matter Digestibility of Panic Grasses under 3-cut Harvest System and during Regrowth Period.

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  • 年3回刈条件下および再生過程におけるパニックグラスとローズグラスの収量,化学組成および乾物消化率
  • 年3回刈条件下および再生過程におけるパニックグラスとローズグラスの収量,化学組成および乾物消化率〔英文〕
  • ネン 3カイカリ ジョウケンカ オヨビ サイセイ カテイ ニ オケル パニックグ

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Abstract

The herbage productivity, chemical composition and in vitro dry matter digestibility (IVDMD) of guineagrass (Panicum maximum JACQ. var. natsukaze), green panic (P. maximum JACQ. var. trichoglume EYLES), colored guineagrass (P. coloratum L.) and rhodesgrass (Chloris gay ana KUNTH var. katambora) under a seasonal 3-cut regime and during regrowth were examined. Guineagrass was the highest yielding species and colored guineagrass was relatively low yielding. The total DM yield of the 3-cuts amounted to 330, 226, 220, and 197kg/a, for guineagrass, green panic, rhodesgrass and colored guineagrass, respectively. The DM yields of guineagrass, green panic and colored guineagrass relative to rhodesgrass, which was a control, were 150, 103, and 90%, respectively. The crude protein content ranged from 8.3 to 14.2% ; colored guineagrass consistently had the highest values. The ranking of mean crude protein content was : colored guineagrass > green panic > rhodesgrass > guineagrass. However, due to the superior performance of other species in terms of DM yield, the ranking order of crude protein yield was : guineagrass > green panic > colored guineagrass > rhodesgrass. Colored guineagrass which gave significantly lower yields of fresh and dry matter, had the highest IVDMD at each cutting. Guineagrass maintained the highest DM yield throughout the regrowth period, whereas the crude protein content and IVDMD, especially at very advanced stage of regrowth, were relatively low. During regrowth, high and negative correlations were found between the cell wall constituents and IVDMD. To obtain a reasonable balance between yield, crude protein content and dry matter digestibility, cutting after 4 weeks may be the best cutting interval for these species. The herbage yield of the panic grasses, especially guineagrass, compared favorably with rhodesgrass. The suitability of these species for making hay and silage, and evaluation of their nutritive value as a ruminant feed are essential and remain to be considered.

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