Table 6. Effect of feeding Se-biofortified hay in a 9-week preconditioning period on relative abundance, median % (interquartile range), of the major nasal microbiota phyla*.
| Phylum | Control | High Se | P value |
|---|---|---|---|
| (n = 15) | (n = 15) | ||
| Firmicutes | |||
| Week 0 (Weaning) | 36.8 (28.9, 42.9) | 32.4 (30.2, 40.6) | 0.42 |
| Week 9 (End of Se Treatment) | 31.7 (27.2, 36.6) | 32.5 (26.1, 37.9) | 0.69 |
| Week 12 (Feedlot) | 32.5 (20.7, 38.1) | 24.5 (16.9, 42.0) | 0.98 |
| Proteobacteria | |||
| Week 0 (Weaning) | 21.8 (17.1, 26.5) | 23.1 (15.8, 28.8) | 0.79 |
| Week 9 (End of Se Treatment) | 25.5 (20.8, 36.7) | 20.8 (17.5, 31.7) | 0.19 |
| Week 12 (Feedlot) | 21.8 (16.4, 34.2) | 22.3 (18.9, 43.5) | 0.58 |
| Bacteroidetes | |||
| Week 0 (Weaning) | 16.0 (15.4, 26.8) | 21.3 (17.0, 23.9) | 0.31 |
| Week 9 (End of Se Treatment) | 26.4 (21.8, 30.6) | 25.4 (20.3, 31.8) | 0.72 |
| Week 12 (Feedlot) | 8.0 (5.0, 12.1) | 7.9 (4.1, 12.5) | 0.58 |
| Actinobacteria | |||
| Week 0 (Weaning) | 12.9 (11.7, 14.5) | 12.2 (10.6, 14.4) | 0.60 |
| Week 9 (End of Se Treatment) | 7.5 (6.4, 8.4) | 7.0 (4.7, 8.4) | 0.58 |
| Week 12 (Feedlot) | 8.7 (6.2, 11.1) | 9.8 (6.3, 12.1) | 0.92 |
| Tenericutes | |||
| Week 0 (Weaning) | 1.52 (1.14, 8.86) | 2.81 (1.25, 5.34) | 0.88 |
| Week 9 (End of Se Treatment) | 3.13 (2.91, 3.95) | 4.11 (3.47, 6.75) | 0.04 |
| Week 12 (Feedlot) | 15.0 (8.80, 33.6) | 20.3 (9.61, 36.7) | 0.92 |
| Euryarchaeota | |||
| Week 0 (Weaning) | 0.30 (0.27, 0.43) | 0.29 (0.22, 0.41) | 0.58 |
| Week 9 (End of Se Treatment) | 0.37 (0.20, 0.44) | 0.34 (0.20, 0.40) | 0.63 |
| Week 12 (Feedlot) | 0.31 (0.14, 0.42) | 0.30 (0.12, 0.44) | 0.95 |
| Verrucomicrobia | |||
| Week 0 (Weaning) | 0.25 (0.19, 0.33) | 0.20 (0.12, 0.32) | 0.49 |
| Week 9 (End of Se Treatment) | 0.40 (0.26, 0.50) | 0.63 (0.38, 0.78) | 0.08 |
| Week 12 (Feedlot) | 0.03 (0.02, 0.04) | 0.03 (0.02, 0.04) | 0.66 |
*Phyla that were observed in 14 or more of 15 calves of Control and High-Se groups throughout the production stages are presented as median % (25%, 75%) relative abundance. Kruskal Wallis rank test was used to compare treatment groups.