Peter H. Janssen
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View article: Methanogenesis inhibition remodels microbial fermentation and stimulates acetogenesis in ruminants
Methanogenesis inhibition remodels microbial fermentation and stimulates acetogenesis in ruminants Open
Rumen microbiota enable ruminants to grow on fibrous plant materials, but also produce methane, driving 5% of global greenhouse gas emissions and leading to a loss of gross energy content. Methanogenesis inhibitors such as 3-nitrooxypropan…
View article: Milk fatty acids and rumen composition as proxy measures of enteric methane
Milk fatty acids and rumen composition as proxy measures of enteric methane Open
Genomic selection is a powerful tool to reduce methane emissions in ruminants. However, it requires large-scale on-farm phenotypic measures of methane. Current technologies to measure methane emissions have several limitations and may not …
View article: Metabolic versatility enables acetogens to colonize ruminants with diet-driven niche partitioning
Metabolic versatility enables acetogens to colonize ruminants with diet-driven niche partitioning Open
Enteric methane emissions are energy losses from farmed ruminants and contribute to global warming. Diverting electrons and H2 flow toward beneficial fermentation products would mitigate ruminal methane emissions while improving feed effic…
View article: Effect of buffer <scp>pH</scp> on methane production and fermentation characteristics of three forages tested <i>in vitro</i>
Effect of buffer <span>pH</span> on methane production and fermentation characteristics of three forages tested <i>in vitro</i> Open
BACKGROUND Low rumen pH is proposed to be a major mechanism for low methane (CH 4 ) emissions from sheep fed forage rape. However, it is difficult to separate this from other in vivo factors, such as rumen passage rate. The objective of th…
View article: Distinct microbial hydrogen and reductant disposal pathways explain interbreed variations in ruminant methane yield
Distinct microbial hydrogen and reductant disposal pathways explain interbreed variations in ruminant methane yield Open
Ruminants are important for global food security but are major sources of the greenhouse gas methane. Methane yield is controlled by the cycling of molecular hydrogen (H 2 ), which is produced during carbohydrate fermentation and consumed …
View article: Complete genome sequence of <i>Methanosphaera</i> sp. ISO3-F5, a rumen methylotrophic methanogen
Complete genome sequence of <i>Methanosphaera</i> sp. ISO3-F5, a rumen methylotrophic methanogen Open
Methanosphaera spp. are methylotrophic methanogenic archaea and members of the order Methanobacteriales with few cultured representatives. Methanosphaera sp. ISO3-F5 was isolated from sheep rumen contents in New Zealand. Here, we report it…
View article: Diversity and community structure of anaerobic gut fungi in the rumen of wild and domesticated herbivores
Diversity and community structure of anaerobic gut fungi in the rumen of wild and domesticated herbivores Open
The rumen houses a diverse community that plays a major role in the digestion process in ruminants. Anaerobic gut fungi (AGF) are key contributors to plant digestion in the rumen. Here, we present a global amplicon-based survey of the rume…
View article: Exploring rumen microbe-derived fibre-degrading activities for improving feed digestibility
Exploring rumen microbe-derived fibre-degrading activities for improving feed digestibility Open
Ruminal fibre degradation is mediated by a complex community of rumen microbes, and its efficiency is crucial for optimal dairy productivity. Enzymes produced by rumen microbes are primarily responsible for degrading the complex structural…
View article: Distinct microbial hydrogen and reductant disposal pathways explain interbreed variations in ruminant methane yield
Distinct microbial hydrogen and reductant disposal pathways explain interbreed variations in ruminant methane yield Open
Ruminants are essential for global food security, but these are major sources of the greenhouse gas methane. Methane yield is controlled by the cycling of molecular hydrogen (H2), which is produced during carbohydrate fermentation and is c…
View article: Characterization of the Ruminal Microbiome of Water Buffaloes (Bubalus bubalis) Kept in Different Ecosystems in the Eastern Amazon
Characterization of the Ruminal Microbiome of Water Buffaloes (Bubalus bubalis) Kept in Different Ecosystems in the Eastern Amazon Open
Increasing the efficiency of rumen fermentation is one of the main ways to maximize the production of ruminants. It is therefore important to understand the ruminal microbiome, as well as environmental influences on that community. However…
View article: Methane prediction equations including genera of rumen bacteria as predictor variables improve prediction accuracy
Methane prediction equations including genera of rumen bacteria as predictor variables improve prediction accuracy Open
Methane (CH 4 ) emissions from ruminants are of a significant environmental concern, necessitating accurate prediction for emission inventories. Existing models rely solely on dietary and host animal-related data, ignoring the predicting p…
View article: Rumen <i>Lachnospiraceae</i> isolate NK3A20 exhibits metabolic flexibility in response to substrate and coculture with a methanogen
Rumen <i>Lachnospiraceae</i> isolate NK3A20 exhibits metabolic flexibility in response to substrate and coculture with a methanogen Open
Hydrogen (H 2 ) is the primary electron donor for methane formation in ruminants, but the H 2 -producing organisms involved are largely uncharacterized. This work integrated studies of microbial physiology and genomics to characterize rume…
View article: Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host
Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host Open
Background Producing animal protein while reducing the animal’s impact on the environment, e.g., through improved feed efficiency and lowered methane emissions, has gained interest in recent years. Genetic selection is one possible path to…
View article: Diversity and community structure of anaerobic gut fungi in the rumen of wild and domesticated herbivores
Diversity and community structure of anaerobic gut fungi in the rumen of wild and domesticated herbivores Open
The rumen houses a diverse community that plays a major role in the digestion process in ruminants. Anaerobic gut fungi (AGF) are key contributors to plant digestion in the rumen. Here, we present a global amplicon-based survey of the rume…
View article: Patterns and determinants of the global herbivorous mycobiome
Patterns and determinants of the global herbivorous mycobiome Open
Despite their role in host nutrition, the anaerobic gut fungal (AGF) component of the herbivorous gut microbiome remains poorly characterized. Here, to examine global patterns and determinants of AGF diversity, we generate and analyze an a…
View article: Aristaeella hokkaidonensis gen. nov. sp. nov. and Aristaeella lactis sp. nov., two rumen bacterial species of a novel proposed family, Aristaeellaceae fam. nov.
Aristaeella hokkaidonensis gen. nov. sp. nov. and Aristaeella lactis sp. nov., two rumen bacterial species of a novel proposed family, Aristaeellaceae fam. nov. Open
Two strains of Gram-negative, anaerobic, rod-shaped bacteria, from an abundant but uncharacterized rumen bacterial group of the order ‘ Christensenellales’ , were phylogenetically and phenotypically characterized. These strains, designated…
View article: Additional file 3 of Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host
Additional file 3 of Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host Open
Additional file 3: Supplemental Table 5: Summary of the biological and systematic effects, including the variance explained by each effect, with cells coloured by effect size. Supplemental Table 6: Detailed parameters and results of F-test…
View article: Additional file 2 of Combining host and rumen metagenome profiling for selection in sheep: prediction of methane, feed efficiency, production, and health traits
Additional file 2 of Combining host and rumen metagenome profiling for selection in sheep: prediction of methane, feed efficiency, production, and health traits Open
Additional file 2: Table S2. Variance components and prediction accuracies for methane-related traits including variance component, accuracy and regression coefficient estimates for the traits related to methane emissions (CH4), methane ra…
View article: Additional file 4 of Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host
Additional file 4 of Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host Open
Additional file 4: Supplemental Table 7: Heritability and repeatability estimates and standard errors for the reference-based approach. Supplemental Table 8: Heritability and repeatability estimates and standard errors for genera from the …
View article: Additional file 1 of Combining host and rumen metagenome profiling for selection in sheep: prediction of methane, feed efficiency, production, and health traits
Additional file 1 of Combining host and rumen metagenome profiling for selection in sheep: prediction of methane, feed efficiency, production, and health traits Open
Additional file 1: Table S1a. Rumen sample information including SRA_number, sample ID, animal ID, flock, year of birth, sample date, diet, age, group, and cohort. Table S1b. Summary of Additional file 1 Table S1a, showing the number of sa…
View article: Additional file 6 of Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host
Additional file 6 of Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host Open
Additional file 6. Supplemental Table 9. The genomic relationship matrix for the New Zealand samples.
View article: Additional file 1 of Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host
Additional file 1 of Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host Open
Additional file 1: Supplemental Table 1. Information for each sample including: SampleID, AnimalID, Flock, Year of Birth (YOB), Sample Date, Diet, Age, Time Off Feed, Feeding, Group, Cohort, Batch, Shelf, Library and Well. Supplemental Tab…
View article: Additional file 4 of Combining host and rumen metagenome profiling for selection in sheep: prediction of methane, feed efficiency, production, and health traits
Additional file 4 of Combining host and rumen metagenome profiling for selection in sheep: prediction of methane, feed efficiency, production, and health traits Open
Additional file 4: Table S4: Proportion of RF profiles (reads) and number of tags attributed to various taxonomies of interest separated by group.
View article: Additional file 3 of Combining host and rumen metagenome profiling for selection in sheep: prediction of methane, feed efficiency, production, and health traits
Additional file 3 of Combining host and rumen metagenome profiling for selection in sheep: prediction of methane, feed efficiency, production, and health traits Open
Additional file 3: Table S3. Variance components and prediction accuracies for selected health and production traits including variance component, accuracy and regression coefficient estimates for the traits of liveweight at 8 months of ag…
View article: Patterns and determinants of the global herbivorous mycobiome
Patterns and determinants of the global herbivorous mycobiome Open
Supplementary table and Figures for the manuscript,
View article: Additional file 2 of Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host
Additional file 2 of Large-scale analysis of sheep rumen metagenome profiles captured by reduced representation sequencing reveals individual profiles are influenced by the environment and genetics of the host Open
Additional file 2. Supplemental Table 4. Sequencing statistics for all samples split by Group.