Table 1: Important bacterial diseases in free-range poultry and the age group where the disease is most often observed
disease
age group
escherichia coli
all ages, but mainly chicks
salmonella spp.
salmonella pullorum
chicks < 3 weeks
salmonella gallinarum
growers, adults
pasteurella multocida
haemophilus paragallinarum (coryza)
clostridium perfringens
all ages, but mainly growers
mycobacterium avium
adults
mycoplasma gallisepticum
all ages
mycoplasma synoviae