Table 1. Characteristics and status of experimental farms

Farms	Regions	Strains	Weeks1	Number of hens	Feeder type
1	Gyeonggi-do	Hy-Line Brown	58	300,000	Hopper
2	Gyeonggi-do	Hy-Line Brown	38	210,000	Hopper
3	Gyeonggi-do	Hy-Line Brown	25	80,000	Hopper
4	Gyeonggi-do	Hy-Line Brown	69	190,000	Hopper
5	Gyeonggi-do	Hy-Line Brown	60	85,000	Hopper
6	Gyeongsangbuk-do	Hy-Line Brown	34	150,000	Chain
7	Gyeonggi-do	Hy-Line Brown	38	95,000	Chain
8	Gyeonggi-do	Lohmann Brown	59	150,000	Chain
9	Gyeonggi-do	Hy-Line Brown	37	260,000	Chain
10	Gyeonggi-do	Hy-Line Brown	56	75,000	Chain
11	Gyeonggi-do	ISA Brown	56	55,000	Hopper
12	Gyeonggi-do	Hy-Line Brown	36	135,000	Chain

1 Weeks = weeks of age.