Table 5.

Effects of the application of colored photoperiodic light during incubation on broiler hatching performance including set egg weight (g egg⁻¹), egg weight loss (%) during the first 18 d, fertility (%), hatchability of fertile eggs (%), chick hatch weight (g bird⁻¹), early, middle, and late embryo mortality rate (%) in Ross 308 broiler hatching eggs.

Wavelength	n1	Egg weight	Egg weight loss2	Fertility3	Hatchability of fertile4	Hatch weight	Early dead5	Middle dead6	Late dead7
Dark	7	64.5	12.67	93.36	87.71	45.2	7.32	0.63	4.32
Blue	8	64.6	11.96	93.81	89.18	45.2	6.73	0.37	3.84
Red	8	64.2	12.40	93.93	89.33	44.6	5.62	0.62	4.43
White	8	64.5	12.05	94.02	89.02	45.3	6.61	0.94	3.43
SEM		0.18	0.320	0.560	0.801	0.26	0.668	0.247	0.736
ANOVA P-value
Wavelength	0.457	0.428	0.8623	0.533	0.248	0.392	0.464	0.766
Block	<0.0001	0.108	<0.0001	<0.0001	<0.0001	<0.0001	0.373	0.001

¹Number of experimental units. Experimental unit = 1 incubator containing 238, 208, 212 and 200 eggs in trial 1, 2, 3 and 4, respectively.

²Egg weight loss percent = (d 0 egg weight–d 18 egg weight)/d 0 egg weight × 100.

³Fertility = (number of fertile eggs/number of eggs set) × 100.

⁴Hatchability of fertile = (number of eggs hatched/number of fertile eggs set) × 100.

⁵Early mortality = (number of dead embryos between 1 and 7 d of incubation/number of fertile eggs set) × 100.

⁶Middle mortality = (number of dead embryos between 8 and 14 d of incubation/number of fertile eggs set) × 100.

⁷Late mortality = (number of dead embryos between 15 d of incubation to external pipping/number of fertile eggs set) × 100.