Influence of Conservation Method on the Fiber Digestion of Italian Ryegrass by Goats

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  • イタリアンライグラスの繊維消化に及ぼす貯蔵方法の影響
  • イタリアンライグラス ノ センイ ショウカ ニ オヨボス チョゾウ ホウホウ

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Abstract

Effect of preservation as hay and silage on the fiber digestion of Italian ryegrass was investigated. From the same harvest at heading stage, field dried hay and wilted silage were prepared. These forages were restrictedly fed to four rumen cannulated goats as a diet consisting of forage-soybean meal (9:1) mixture to determine nutrient digestibility, nitrogen balance, rumen degradability of DM and NDF, particle-bound carboxymethylcellulase (CMCase) activity, and rate of passage of liquid (Co-EDTA) and solid digesta (Cr-CWC). The wilted silage (DM 30.8%) showed a relatively high pH value 4.75 and a butyrate-rich fermentation. The hay showed higher NDF, NDIN and ADIN contents than silage, suggesting some protein became associated with fibrous components during hay-making. All the digestibility of silage diet was higher than those of hay diet, while significant difference could not be detected in fiber digestibility. When goats were fed silage, they retained more nitrogen than those on hay. The silage had more rumen soluble (5.5 and 0.0%) and less degradable (71.4 and 74.4%) NDF compared with hay. The rate of NDF degradation was lower in silage than hay (3.2 and 4.2%h-1), which may partly be ascribed to lower CMCase activity of silage. No significant difference was observed in the rate of passage of either liquid or feed particles. These results indicate that there is considerable difference as energy source in the fibrous components between hay and silage as well as a marked difference of soluble carbohydrate and volatile fatty acid contents.

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