Fig. 6

Effect of Lp. plantarum FRT4 on differential metabolites and metabolism pathways in caecal content of laying hens. A The differential metabolites in caecal content for the HELP group compared to the CT group. B The differential metabolites in caecal content for the FRT4M group compared to the HELP group. C The differential metabolism pathway based on differential metabolites for the HELP group compared to the CT group. D The differential metabolism pathway based on differential metabolites for the FRT4M group compared to the HELP group. CT: control group, hens fed with normal diet. HELP: model group, hens fed with high-energy low-protein diet. FRT4M: experimental groups, hens fed with high-energy low-protein diet with 1010 CFU/kg Lp. plantarum FRT4