Effects of Heat Exposure on the Rumination and Passage Rate of Feeds Through the Digestive Tract of Goats

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  • 暑熱暴露がヤギの消化管通過速度と第一胃収縮運動に与える影響
  • ショネツ バクロ ガ ヤギ ノ ショウカカン ツウカ ソクド ト ダイ1イ シュウシュク ウンドウ ニ アタエル エイキョウ

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Abstract

A study was undertaken to determine the effect of heat exposure (33°C, 80%) on the rumen volatile fatty acids (VFA) concentration, rumination and passage rate of feeds through the digestive tract of goats. Goats initially housed in thermoneutral environment (20°C, 80%) were fed once daily with equal amounts of sudan grass hay (2cm-cut) in both environments. The digestibilities of crude protein and neutral detergent fiber (NDF) were higher in heat exposure (P<0.05). The concentration of VFA, particularly n-butyric acid, in the rumen tended to increase in heat exposure. Also, the passage rate of feeds through the digestive tract of goats tended to decrease. The amplitude and frequency of contract in internal pressur of the rumen were higher in heat exposure (P<0.05).

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