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This paper reviewed the effects of lighted incubation ( in ovo  lighting) on incubation performance and chick quality in broilers. Globally, the broiler chicken industry is among the fastest growing commercial sectors. Chicken meat has the fastest growth rate compared to other common animal protein sources, and its demand will always increase due to increasing population growth worldwide. Therefore, a need for a proportional increase in hatchery efficacy is also increasing with this demand. Over the past decades, implementation of artificial light during incubation in broiler chickens has accelerated with key considerations such as light colour, light source, photoperiod, eggshell colour, pigmentation, light shape and light intensity. Photostimulation has a significant effect on embryo development during the last quarter (from 14 to 21 day of incubation). However, incubating eggs under light from day 1 to 18 improves embryo development and hatchability compared with lighting for 21 days. A photoperiod of 12 L:12 D improves hatchability, chick weight and leg health compared with 24 L and 24 D. High light intensity decreases hatching traits such as chick weight. While incubation under green light increases muscle growth and weight gain of chicks, lighted incubation with red and white light enhances hatchability compared with other wavelengths and darkness. In conclusion, it is important to continue studies on lighted incubation to identify the exact mechanisms of how other light colours impact embryogenesis and investigate the interaction or synergistic effects of a combination of two or more wavelengths.

Lighted incubation: embryonic development, hatchability and hatching quality of broiler chicks