Fermentation Quality and Feeding Value of Panic Grasses and Rhodesgrass Silages

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  • パニックグラスおよびローズグラスサイレージの発酵品質と飼料価値
  • パニックグラスおよびローズグラスサイレージの発酵品質と飼料価値〔英文〕
  • パニック グラス オヨビ ローズグラス サイレージ ノ ハッコウ ヒンシツ ト

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Abstract

The fermentation quality and feeding value of guineagrass (Panicum maximum JACQ var. natsukaze), green panic (P. maximum var. trichoglume EYLES), colored guineagrass (P. coloratum L.) and rhodesgrass (Chioris gayana KUNTH var. katambora), under a silage cutting regime of three harvest per growing season were evaluated. The first and second cuttings were field wilted before ensiling but the third was not wilted due to poor weather conditions. In digestion trails the silages were fed to four wethers. The pH values of all silages were high, ranging from 4.6 to 5.8. The lowest pH values were consistently obtained from silages made from Unwilted herbage of the third cutting. The silages were well preserved as indicated by the low contents of butyric acid and volatile basic nitrogen as a percentage of total nitrogen (VBN/T-N). Most of the silages contained more lactic acid than acetic acid. However, the second and third cuttings of green panic and second cutting of colored guineagrass produced acetate-type silages. With the exception of silage prepared from the first cutting of guineagrass, differences among and within the species in digestibilities of DM and other constituents were small. The mean DCP content was in the ranking order green panic (6.6%)>colored guineagrass (5.9%)=rhodesgrass (5.9%)>guineagrass (5.3%). The mean TDN content was in the increasing order of guineagrass (51.8%), green panic (51.9%), colored guineagrass (52.1%), rhodesgrass (53.3%), with only slight differences among species. Relative to rhodesgrass, which was used as a comparison species, the DCP yields of guineagrass, green panic and colored guineagrass were 142, 130, and 102%, respectively. The respective TDN yields of guineagrass, green panic and colored guineagrass were 146, 106, and 91% of that of rhodesgrass. Guineagrass and green panic showed the considerable potential of DCP and TDN yields and compared favorably with rhodesgrass.

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