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Nitrate decreases ruminal methane production with slight changes to ruminal methanogen composition of nitrate-adapted steers
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Nitrate decreases ruminal methane production with slight changes to ruminal methanogen composition of nitrate-adapted steers
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Journal Article
Nitrate decreases ruminal methane production with slight changes to ruminal methanogen composition of nitrate-adapted steers
2018
Overview
Background
This study was conducted to examine effects of nitrate on ruminal methane production, methanogen abundance, and composition. Six rumen-fistulated Limousin×Jinnan steers were fed diets supplemented with either 0% (0NR), 1% (1NR), or 2% (2NR) nitrate (dry matter basis) regimens in succession. Rumen fluid was taken after two-week adaptation for evaluation of in vitro methane production, methanogen abundance, and composition measurements.
Results
Results showed that nitrate significantly decreased in vitro ruminal methane production at 6 h, 12 h, and 24 h (
P
< 0.01; P < 0.01;
P
= 0.01). The 1NR and 2NR regimens numerically reduced the methanogen population by 4.47% and 25.82% respectively. However, there was no significant difference observed between treatments. The alpha and beta diversity of the methanogen community was not significantly changed by nitrate either. However, the relative abundance of the methanogen genera was greatly changed.
Methanosphaera
(P
L
= 0.0033) and
Methanimicrococcus
(P
L
= 0.0113) abundance increased linearly commensurate with increasing nitration levels, while
Methanoplanus
abundance was significantly decreased (P
L
= 0.0013). The population of
Methanoculleus,
the least frequently identified genus in this study, exhibited quadratic growth from 0% to 2% when nitrate was added (P
Q
= 0.0140).
Conclusions
Correlation analysis found that methane reduction was significantly related to
Methanobrevibacter
and
Methanoplanus
abundance, and negatively correlated with
Methanosphaera
and
Methanimicrococcus
abundance.
Publisher
BioMed Central,BioMed Central Ltd,BMC
Subject
/ Animals
/ Biomedical and Life Sciences
/ Cattle
/ Ecological and evolutionary microbiology
/ Euryarchaeota - drug effects
/ Euryarchaeota - growth & development
/ Methane
/ Methanobacteriaceae - drug effects
/ Methanobacteriaceae - growth & development
/ Methanobacteriaceae - metabolism
/ Methanobrevibacter - drug effects
/ Methanobrevibacter - growth & development
/ Methanobrevibacter - metabolism
/ Methanomicrobiaceae - drug effects
/ Methanomicrobiaceae - growth & development
/ Methanomicrobiaceae - metabolism
/ Methanosarcinales - drug effects
/ Methanosarcinales - growth & development
/ Methanosarcinales - metabolism
/ Mycology
/ Nitrate
/ Nitrates
/ RNA, Ribosomal, 16S - genetics
/ Rumen
/ Virology
