Table 7.

Effects of the application of colored photoperiodic light during incubation on yolk-free body weight (YFBW) (g), relative YFBW (%), relative weight (g kg⁻¹) of spleen, bursa of Fabricius, and liver in Ross 308 broiler chicks at hatch.

Wavelength	Gender	n1	Yolk-free body weight	Relative YFBW	Relative spleen weight	Relative bursa of Fabricius weight	Relative liver weight
Dark	Female	7	37.9	86.89	0.52	1.28c	38.59
	Male	7	38.8	86.69	0.57	1.53a	36.09
Blue	Female	8	39.6	87.69	0.60	1.44abc	38.60
	Male	8	39.2	86.50	0.54	1.31bc	36.07
Red	Female	8	38.6	88.53	0.57	1.39abc	39.61
	Male	8	38.9	87.07	0.55	1.46ab	37.44
White	Female	8	38.7	87.31	0.55	1.28c	36.21
	Male	8	39.1	87.68	0.58	1.49ab	35.38
SEM			0.66	0.600	0.025	0.065	0.943
ANOVA P-value
Wavelength (W)			0.411	0.326	0.754	0.861	0.054
Gender (G)			0.470	0.134	0.918	0.029	0.006
W × G			0.821	0.335	0.212	0.014	0.786
Block			0.0002	<0.0001	0.009	0.0003	0.007

¹Number of experimental units. Experimental unit = 40 birds per gender hatched from each incubator.

^a,b,cMeans within a column with different letters differ significantly according to Tukey-Kramer test (α = 0.05).