Abo Ghanima Mahmoud M, Abd El-Hack Mohamed E, Abougabal Mohammed Sh, Taha Ayman E, Tufarelli Vincenzo, Laudadio Vito, Naiel Mohammed A E
Department of Animal Husbandry and Animal Wealth Development, Faculty of Veterinary Medicine, Damanhour University, Damanhour 22511, Egypt.
Department of Poultry, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt.
Anim Biosci. 2021 Jul;34(7):1243-1252. doi: 10.5713/ajas.20.0328. Epub 2020 Aug 21.
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.
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.
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).
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.
进行一项实验，以研究持续光照和间歇光照方案对肉鸡生产性能、胴体性状、血液生化参数、先天免疫和氧化状态的影响。
根据光照方案，将总共600只1日龄的科宝500肉鸡随机分为6个相等的组（每组100只鸡，每组5个重复，每个重复20只鸡）；22小时持续光照（22C）、每天两次11小时光照 + 1小时黑暗（11L/1D）、20小时持续光照（20C）、每天四次5小时光照 + 1小时黑暗（5L/1D）、18小时持续光照（18C），最后一组每天进行6次3小时光照 + 1小时黑暗（3L/1D）。实验期持续42天。
与间歇光照方案下的肉鸡相比，接受22小时持续光照的肉鸡在活体体重和胴体（屠宰率和胸肉百分比）测量性状方面有显著改善。虽然减少光照时间显著降低了采食量和饲料转化率值。不同的光照方案对所有血液生化参数均无显著影响。通过减少光照时间（3L/1D），氧化应激和先天免疫参数显著增强。
研究结果表明，与肉鸡的持续光照方案相比，将光照时间减少至3L/1D在提高饲料效率、先天免疫和氧化状态方面更有用。
