Table 1 Details of layer farms at the time of the first treatment

01-A

Barn, 2 rooms connected by a not-fully hermetic ceiling

Dekalb white

19,500

40

02-A

Barn with free range, 2 rooms, separated by a wall, connected by a not-fully hermetic door with 2 outdoor areas separated by a fence

ISA Brown

550

63 (C), 54 (T)

06-A

2 rooms, separated by a corridor. Enriched cages

ISA Brown

66,000

40

07-A

1 building, 2 rooms, separated by a corridor. Enriched cages

Novo Brown

62,000

36

09-A

2 separate buildings. Enriched cages

Lohmann Brown

100,000

22 (T), 27 (C)

DC1

2 separate buildings and free-range area

Lohmann brown

2714 (T), 2700 (C)

46

DC2

2 separate buildings. Enriched cages

Hy-Line brown

32,462 (T), 18,851 (C)

58

DC3

2 separate buildings. Enriched cages

Lohmann LSL

54,947 (T), 54,987 (C)

53 (T), 54 (C)