FIGURE 3.

Novel object test in four different lighting program houses (5 lx, 20 lx, NL, and VL) at different ages (A) age of day 31, (B) age of day 38, (C) age of day 46, and (D) age of day 52. Numbers of birds approaching the novel object were obtained in the sequential time points (30 sec, 1, 5, 10, and 15 min) in each section of the houses, and data (mean ± SEM) were compared among treatments. Different lower-case letters above the bars denote significant differences (p < 0.05) among groups, where a>b>c>d>e>f and a,b is not different from a or b.