Fig. 1

Heat map displaying the resistance percentage of E. coli isolates recovered on (MC) media according to sample type and rearing stage. Samples were collected from five farms with conventional hatching (CH) and five farms with on-farm hatching (OH), both with low antimicrobial use. a(OH = on-farm hatching; CH = conventional hatching). Resistance to imipenem, amikacin, ceftazidime, cefpodoxime or ceftiofur was not detected in any isolate