Table 3 Farm characteristics and history

No of farms

12

2

Number of broilers per farm

89,950^a

87,500^a

Number of houses per farm

11.1^a

6.5^a

Number of houses affected per farm

7.2^a

1.5^a

Type of management – multi-age

Multi-age

Multi-age

Type of housing – open-sided housing

Open

Open

Farms within 1 km of affected farm

92 %^a

50 %^a

Poor performance in the last 2 grow outs

50 %^c

0 %^d

Neighboring farms with history of disease

91.7 %^a

0 %^b

Complaints of poor day-old-chick quality

50 %^c

50 %^d

Disease after IBD vaccination or about Week 2-3

83.3 %^a

50 %^b

Suspected source of chicks from breeder farms with disease

66.7 %^a

0 %^b