Table 2 Details of replacement and breeder farms at the time of the first treatment

02-B

Barn, 2 rooms, separated by a corridor, 2 doors

Tetra Brown

4600 (T); 7500 (C)

13

02-C

Barn, 2 rooms, separated by a corridor, 2 doors

Tetra Brown, Harco Black, Koenigsberger Blue and Sussex

3000

11

04-A

Barn, 2 separate houses

Ross 308 (cocks and hens)

28,000

35 (T); 34 (C)

05-A

Barn, 2 separate houses

RJ344 (cocks) and Ross PM3 J (hens)

8200

41