TABLE 4.
Effect of treatment on relative abundance of the main genera* on weaning day versus 4 weeks after (group averages shown).
|
Treatment1 |
||||||||||
|
CON |
PCON |
ENZ |
||||||||
| Genera | At weaning2 | Post-weaning3 | Contrast4 | At weaning2 | Post-weaning3 | Contrast4 | At weaning2 | Post-weaning3 | Contrast4 | |
| Prevotella | 15.4 | 18.3 | 0.99 | 18.1 | 22.1 | 0.16 | 20.1 | 21.6 | 0.99 | |
| CF231 | 3.0 | 2.9 | 0.99 | 3.3 | 2.4 | 0.20 | 2.7 | 2.9 | 0.99 | |
| RFN20 | 2.7 | 3.1 | 0.99 | 2.3 | 2.2 | 0.99 | 2.5 | 2.3 | 0.99 | |
| Treponema | 2.4 | 2.0 | 0.99 | 1.8 | 1.5 | 0.99 | 1.6 | 1.6 | 0.99 | |
| YRC22 | 1.3 | 1.1 | 0.99 | 1.6 | 1.3 | 0.99 | 1.2 | 1.8 | 0.24 | |
| Pseudobutyrivibrio | 1.1 | 1.1 | 0.99 | 1.2 | 1.1 | 0.99 | 1.1 | 1.5 | 0.99 | |
| Ruminococcus | 1.1 | 1.6 | 0.11 | 1.1 | 1.7 | 0.03 | 0.9 | 1.3 | 0.72 | |
| Anaeroplasma | 0.8 | 2.2 | 0.01 | 0.8 | 1.5 | 0.76 | 1.0 | 1.8 | 0.59 | |
| Succiniclasticum | 0.6 | 1.1 | 0.55 | 0.9 | 1.3 | 0.73 | 0.9 | 1.2 | 0.99 | |
| Methanobrevibacter | 0.5 | 0.7 | 0.99 | 0.6 | 0.7 | 0.99 | 1.3 | 0.8 | 0.99 | |
| Butyrivibrio | 0.5 | 0.8 | 0.10 | 0.7 | 0.8 | 0.99 | 0.6 | 0.7 | 0.99 | |
| Coprococcus | 0.4 | 0.7 | 0.01 | 0.5 | 0.8 | 0.01 | 0.5 | 0.7 | 0.56 | |
*Genera that were individually identified and were present at ≥0.5% in at least one treatment group. 1 CON = conventional cow-calf system without supplementation of calves. PCON = calves were creep fed. ENZ = calves were creep fed with an enhanced feed containing xylanase; 2 At weaning: ruminal samples collected on weaning day; 3 Post-weaning: ruminal samples collected 4 weeks after calves were weaned; 4 Contrast: P-value calculated using the Bonferroni-corrected pairwise comparison within treatment for “At weaning” vs. “Post-weaning.”