Table 2.

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

Farm	Housing	Breed	Birds/Unit	Age (weeks)
Replacement farms
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
Breeder farms
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

Abbreviations: T treatment group, C control group