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Effect of cashew nut shell liquid on metabolic hydrogen flow on bovine rumen fermentation
Author(s) -
Mitsumori Makoto,
Enishi Osamu,
Shinkai Takumi,
Higuchi Koji,
Kobayashi Yosuke,
Takenaka Akio,
Nagashima Kyo,
Mochizuki Masami,
Kobayashi Yasuo
Publication year - 2014
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/asj.12133
Subject(s) - fermentation , rumen , food science , nut , chemistry , shell (structure) , biochemistry , materials science , composite material , structural engineering , engineering
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 .