Table 3.

Amount of hen movement from the top tier in the dark period observation in different stages of the lay cycle as indicated by kappa coefficient (K).

Stage	B1	B2	W1	W2
Peak lay	0.89	0.92	0.65	0.71
Mid lay	0.84	0.79	0.56	0.52
End lay	0.69	0.72	0.39	0.45

Results are expressed as K coefficients (degree of agreement), with higher values indicating higher agreement among percentage of hens and, therefore, less movement of hens from the top tier within an aviary unit (B1 = Hy-Line Brown, B2 = Bovans Brown, W1 = DeKalb White, and W2 = Hy-Line W36).