From the physiological point of view, is it better to expose birds to continuous or intermittent light?

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Growth, carcass traits, immunity and oxidative status of broilers exposed to continuous or intermittent lighting programs

Mahmoud M. Abo Ghanima, Mohamed E. Abd El-Hack, Mohammed Sh. Abougabal, Ayman E. Taha, Vincenzo Tufarelli, Vito Laudadio, Mohammed A. E. Naiel

Animal Bioscience 2021; 34(7): 1243-1252.

Published online: August 21, 2020

https://doi.org/10.5713/ajas.20.0328

"Abstract

Objective

An experiment was conducted to investigate the continuous and intermittent lighting program effects on terms of the productive performance, carcass traits, blood biochemical parameters, innate immune and oxidative status in broiler chicks.

Methods

A total of 600 Cobb-500 one day old chicks were randomly allocated into six equal groups (100 chicks per treated group with five replicates of 20 chicks each) based on lighting program; 22 continuous lighting (22 C), 11 h lighting+1 darkness twice daily (11 L/1 D), 20 h continuous lighting (20 C), 5 h lighting+1 darkness four times daily (5 L/1 D), 18 h continuous lighting (18 C) and the final group subjected for 3 h lighting+1 h darkness six times daily (3 L/1 D). The experimental period lasted 42 days.

Results

Compared with those under the intermittent light program, broiler chicks exposed to continuous lighting for 22 h had significant improvement in live body weight and carcass (dressing and breast percentage) measured traits. Though reducing lighting hours significantly reduced feed intake and feed conversion ratio values. Different lighting programs revealed no significant effect on all blood biochemical parameters. Oxidative stress and innate immunity parameters significantly enhance by reducing lighting hours (3L/1D).

Conclusion

The findings suggest that reducing lighting hours up to 3L/1D would be more useful in enhancing feed efficiency, innate immunity, and oxidative status compared with continuous lighting programs on broilers."

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