Figure 8. Differential bacterial genera between CON (all feeds without AOAN supplementation) and AOAN (all feeds
with AOAN supplementation) (A), TMR and TMR + AOAN (B), oat hay and oat hay + AOAN (C), alfalfa hay and alfalfa
hay + AOAN (D). AOAN indicated feed fermentation with Aspergillus oryzae and Aspergillus niger co-cultivation fermen-
tation extract. CON group indicates all feeds without AOAN supplementation. AOAN group indicates all feeds with
AOAN supplementation. Significant differences were tested by linear discriminant analysis effect size (LEfSe) and de-
clared as |linear discriminant analysis score| > 2 and adjusted-p < 0.10. The genera in red indicate that the genus was
enriched more than three times. TMR, total mixed ration.
3.4.4. Spearman Correlation Analysis
Spearman correlation analysis between the relative abundance of genus features
from AOAN vs. CON and phenotypic indices is shown in Figure 9. The results show that
the relative abundance of Prevotella_1, Prevotella_UCG_001, and Anaerovibrio were posi-
tively correlated with DM digestibility, TVFA, and molar proportion of acetate (p < 0.05),
and negatively correlated with the molar proportion of butyrate (p < 0.05). The relative
abundance of Prevotella_UCG_003 and Prevotella_UCG_001 were positively correlated
with acetate to propionate ratio (p < 0.05). There was a significant negative correlation
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