Light intensity during rearing affects the behavioural synchrony and resting patterns of broiler chickens
Light intensity during rearing affects the behavioural synchrony and resting patterns of broiler chickens
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DOI：
10.1080/00071660902942775
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发表时间：
2009-01-01
影响因子：
2
通讯作者：
Mench, J. A.
中科院分区：
文献类型：
--
作者：
Alvino, G. M.;Blatchford, R. A.;Mench, J. A.
1.通过将504只Cobb鸡随机分配到低（5勒克斯），中等（50勒克斯），或高（200勒克斯）的白天照明下的16小时L：8小时D光周期的环境室中，研究了光强度对肉鸡行为同步性和休息的影响。我们假设，行为的同步性和休息行为将受到影响的光：暗振幅，并预测，在较高的强度饲养的肉鸡将显示出增加的同步性，从而有更少，但更长的时间，在暗期休息的较量，因为这些较量将不太可能被打断活跃的鸟类。2.数字记录了48小时，从第3周至第5周的年龄，并扫描样品采取的11个行为在15分钟的时间间隔。使用一致性的kappa系数计算同步量的Z分数。休息回合的频率和长度以及由群友中断休息回合的次数也通过对每个围栏4只焦点肉鸡的连续观察来计算。3.在3周观察期间，所有处理组的休息和坐姿行为显著同步或显示出强烈的同步趋势。有显着的处理差异的程度上的同步性，梳理，吃，休息和饲料，与肉鸡饲养在200勒克斯表现出最大程度的同步性。4.在暗相期间，高光照饲养的肉鸡比中光照或低光照饲养的肉鸡有更少、更长、更少的间歇性休息。在此期间，低光照处理的肉鸡比中光照和高光照处理的肉鸡有更频繁、更长和更多的间歇性休息。5.总之，饲养肉鸡在16小时L：8小时D的光周期与白天高光强导致更大的行为同步的羊群，有可能提高福利增加不间断的休息行为在黑暗阶段。
1. The effect of light intensity on behavioural synchrony and rest in broilers was investigated by randomly assigning 504 Cobb chicks to environmental chambers at low (5 lux), moderate (50 lux), or high (200 lux) daytime illumination under a 16 h L : 8 h D light cycle. We hypothesised that behavioural synchrony and resting behaviour would be affected by light : dark amplitude, and predicted that broilers reared at higher intensities would show increased synchrony and thus have fewer, but longer, resting bouts during the scotophase, since these bouts would be less likely to be interrupted by active birds. 2. Digital recordings were made for 48 h from weeks 3 to 5 of age, and scan samples taken of 11 behaviours at 15-min intervals. Z-scores for the amount of synchronisation were calculated using the kappa coefficient of agreement. Frequency and length of resting bouts and the number of resting bout interruptions by flockmates were also calculated from continuous observations of 4 focal broilers per pen. 3. Resting and sitting behaviour were significantly synchronised or showed a strong trend towards synchronisation in all treatments during the 3 weeks of observation. There were significant treatment differences in the degree of synchrony for preen, eat, rest and forage, with broilers reared in 200 lux showing the greatest degree of synchrony. 4. During the scotophase, broilers reared with high illumination had fewer, longer, and less interrupted bouts of resting than those reared with moderate or low illumination. During the photophase, broilers in the low-illumination treatment had more frequent, longer, and more interrupted resting bouts than those in the moderate or high illumination treatment. 5. In conclusion, rearing broilers under a 16 h L : 8 h D photoperiod with high daytime light intensity resulted in greater behavioural synchrony in the flock, with the potential to improve welfare by increasing uninterrupted resting behaviour during the dark phase.