Table 1 Overview of mortality, productivity, and the study population of broiler breeders

General

Flock mortality

Productivity

Birds included in the study

Farm

Flock size

Bird/m²

Mortality, total (%)

Total no. of dead birds

Eggs/hen

Hatching (%)

No. of chicks delivered/ hen

Chick mortality, first week (%)

Chick mortality, total, average (%)

Chick slaughter condemnation, average (%)

No. of birds for post-mortem examination

No. of birds sampled for bacteriology

No. of Escherichia coli isolates subjected to genome sequencing