Table 5.
Effect of additives and NE challenge on caecal bacterial genomic DNA copies (expressed as log10 copies/g digesta) on d 16.1
| Item | UCC | NE challenged2 |
SEM | P-value | ||||
|---|---|---|---|---|---|---|---|---|
| CHC | BAC | SMP | SMF | SHM | ||||
| Lactobacillus spp. | 9.31 | 9.36 | 9.50 | 9.82 | 9.57 | 9.38 | 0.12 | 0.058 |
| Bifidobacteria spp. | 8.68 | 8.66 | 8.70 | 8.75 | 8.52 | 8.67 | 0.11 | 0.741 |
| Bacteroides spp. | 5.03b | 5.65a | 5.05b | 5.18b | 5.11b | 5.08b | 0.13 | 0.013 |
| Bacillus spp. | 7.85 | 7.04 | 6.94 | 7.34 | 7.16 | 7.02 | 0.24 | 0.114 |
| Ruminococcus spp. | 9.64a | 9.31b | 9.23b | 9.26b | 9.26b | 9.24b | 0.09 | 0.025 |
| Enterobacteriaceae | 7.36b | 8.72a | 9.69a | 9.52a | 9.15a | 8.97a | 0.35 | <0.001 |
| Clostridium pefringens | 0.84c | 9.31a | 5.96b | 8.96a | 8.48ab | 8.04ab | 0.61 | <0.001 |
| Total bacteria | 11.40 | 11.16 | 11.21 | 11.36 | 11.23 | 11.12 | 0.08 | 0.120 |
NE = necrotic enteritis.
a – c Values in a row with no common superscripts differ significantly (P < 0.05). Mean values are based on 2 birds per replicate and 7 replicates per treatment.
1
UCC, unchallenged control; CHC, challenged control; BAC, zinc bacitracin; SMP, a blend of short-chain fatty acids (SCFA), medium-chain fatty acids (MCFA) and phenolic compound; SMF, a blend of buffered SCFA with MCFA; SHM, a blend of buffered SCFA with a high concentration of MCFA.
2
NE challenged birds were gavaged with Eimeria spp. at d 9 and C. perfringens at d 14.