TLR4 and infection: Our findings showed that supplementing the rabbits with TQN significantly (p < 0.05) upregulated the transcription levels of IL-10 (Figure 4D), TLR-4 (Figure 4E), DEFB1 (Figure 4G) and TLR-2 (Figure 4H) genes comparing with the control non-supplemented rabbits at 96 h post-infection with P. multocida strain.