Table 2. Effect of LED colors on egg quality parameters in brown laying hens housed on floor

Parameters	LED colors				SEM	P-values
Parameters	Red	Blue	Green	White	SEM	P-values
Shell color¹	12.28^ab	11.85^c	12.00^bc	12.49^a	0.080	0.006
Shell strength (kg/cm²)	3.63^b	3.82^a	3.74^ab	3.58^b	0.035	0.047
Shell thickness (mm)	0.381	0.384	0.380	0.383	0.001	0.474
Haugh unit²	88.45^a	83.67^c	86.65^ab	85.37^bc	0.533	0.001
Yolk color³	5.54	5.45	5.32	5.36	0.042	0.273

SEM, Standard error of means.
Shell color represents colors of egg from 1 (ivory color) to 15 (dark brown).
Haugh unit is indicator representing freshness of egg that higher score means fresher.
Yolk color score 1 (light yellow) to 15 (deep red) by color fan indicate increasing reddish yellow color by higher number.
Means in same rows with different superscripts are significantly different (P<0.05).