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Table 2 Effects of specific factors on equine intestinal organism abundances

From: The gut microbiome of horses: current research on equine enteral microbiota and future perspectives

FactorEffect on organism abundanceOrganisms in enteral microbiomeReference
highly concentrated (grain) feedincreaselactic acid bacteria, especially Streptococcus spp. and Lactobacillus spp.[181] [31]
high-starch fedincreaseSuccinivibrio[28]
high-starch feddecreaseClostridiales, Lachnospiraceae[28]
haylageputative increaseFibrobacter succinogenes, Fibrobacter intestinalis[106]
grass-based dietincreaseBacteroidetes, Lachnospiraceae Bacillus,
Lactobacillus, Streptococcus
[181]
grass-based dietdecreaseFibrobacter, Ruminococcus[181]
high oil and high starch dietsincreaseProteobacteria[28]
increasing ageincreaseEuryarchaeota, Actinobacteria, Bacteroidetes, Chlamydiae, Chloroflexi, Planctomycetes, Spirochaetes, TM7, Verrucomicrobia[182]
increasing agedecreaseProteobacteria, Gammaproteobacteria, Enterobacteriaceae, Enterococcus[182]
domesticationlowerMethanocorpusculum[101]
pH below 6.0decreaseRuminococcus albus, Fibrobacter succinogenes[6]
pH below 6.0increaseStreptococcus bovis, Lactobacillus spp., Mitzuokella spp.[6]
parasite egg burdendecreaseBacteroides, Clostridium XIVa, Ruminococcus, unclassified Lachnospiraceae[178, 183]
parasite egg burdenincreaseClostridium IV, Coprococcus, Anaerovibrio, Agreia, Oscillibacter, Turicibacer, unclassified Cystobacteraceae, Campylobacter, Bacillus, Pseudomonas[178, 183]
laminitisincreaseLactobacilli, Escherichia coli[138, 184]