Effect of cashew nut shell liquid on metabolic hydrogen flow on bovine rumen fermentation |
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Authors: | Makoto Mitsumori Osamu Enishi Takumi Shinkai Koji Higuchi Yosuke Kobayashi Akio Takenaka Kyo Nagashima Masami Mochizuki Yasuo Kobayashi |
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Institution: | 1. National Institute of Livestock and Grassland Science, , Tsukuba, Ibaraki;2. Environment and Biotechnology Laboratory, Idemitsu Kosan Co. Ltd, , Sodegaura;3. Research Faculty of Agriculture, Hokkaido University, , Sapporo, Hokkaido, Japan |
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Abstract: | Effect of cashew nut shell liquid (CNSL), a methane inhibitor, on bovine rumen fermentation was investigated through analysis of the metabolic hydrogen flow estimated from concentrations of short‐chain fatty acids (SCFA) and methane. Three cows were fed a concentrate and hay diet without or with a CNSL‐containing pellet. Two trials were conducted using CNSL pellets blended with only silica (trial 1) or with several other ingredients (trial 2). Methane production was measured in a respiration chamber system, and energy balance and nutrient digestibility were monitored. The estimated flow of metabolic hydrogen demonstrated that a part of metabolic hydrogen was used for hydrogen gas production, and a large amount of it flowed into production of methane and SCFA in both trial 1 and 2, when CNSL was administered to the bovine rumen. The results obtained by regression analyses showed that the effect of CNSL supply on methane reduction was coupled with a significant (P < 0.01) decrease of acetate and a significant (P < 0.01) increase of propionate and hydrogen gas. These findings reveal that CNSL is able to reduce methane and acetate production, and to increase hydrogen gas and propionate production in vivo. |
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Keywords: | cashew nut shell liquid hydrogen gas metabolic hydrogen methane rumen |
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