Effects of light intensity and beak trimming on preventing aggression in laying hens
Effects of light intensity and beak trimming on preventing aggression in laying hens
复制标题
光照强度和断喙对防止蛋鸡攻击行为的影响
DOI：
10.1111/j.1740-0929.2006.00371.x
复制
发表时间：
2006
影响因子：
2
通讯作者：
Toshio Tanaka
中科院分区：
文献类型：
--
作者：
T. Shinmura;Y. Eguchi;K. Uetake;Toshio Tanaka
本试验旨在研究降低光照强度和修剪喙部对蛋鸡攻击防御的影响。总共使用了181辆白色来角车。在17周龄时，36只鸟被分配到电池笼（3只鸟/笼），36只鸟被分配到带家具的笼（4只鸟/笼），109只鸟被转移到鸟舍。由于23周龄后，特别是在带家具的笼中，攻击行为增加（从0.3%增加到6.0%），28周龄时，白天光照强度下降到十分之一左右（从680勒克斯减少到70勒克斯）。然后，在29周龄时，在带家具的笼子里的鸟用烧杯轻轻修整它们的喙。使用扫描技术每隔10分钟进行一次行为观察。测定采食量、体重和羽毛评分。减少光照前后，三种住房系统的攻击行为无显著差异。另外，在带家具的笼中，刚修喙和修喙4周后，攻击性鸟的比例显著降低（P < 0.05和P < 0.01）。攻击性也变得与在电池笼和鸟舍中观察到的比例相似。与攻击性降低的比例相比，食鸟比例显著降低（P < 0.05）。但采食量和体重没有显著下降。在攻击减少的情况下，鸟类的整毛比例显著增加（P < 0.05）。在带家具的笼子的尘浴处和鸟舍的窝底处，攻击行为更为频繁（P < 0.001）。25 ~ 29周龄（修喙期）带家具笼的雏鸟各身体部位的总羽毛评分显著升高（P < 0.01）， 29 ~ 33周龄无显著升高（P < 0.01）。在带家具的笼中，颈、胸、尾羽评分的增量较小。综上所述，在任何住房系统中，减少光照前后的攻击行为没有显著差异。然而，在带家具的笼子里，攻击行为不仅通过降低光照强度，而且通过额外的喙修剪来减少。羽毛状况的恶化-特别是在颈部，乳房和背部-通过治疗得到了预防。
This study aimed to investigate the effects of decreased light intensity and beak trimming on aggression prevention in laying hens. In total, 181 White Leghorns were used. At 17 weeks of age, 36 birds were allocated to battery cages (three birds/cage), 36 birds to furnished cages (four birds/cage), and 109 birds were transferred to an aviary. Since aggression increased in the birds from 23 weeks of age (from 0.3% to 6.0%) especially in the furnished cages, , the light intensity during the daytime was decreased to about one-tenth (from 680 lux to 70 lux) at 28 weeks of age. The birds in the furnished cages then had their beaks re-trimmed lightly by using a debeaker at 29 weeks of age. Behavioral observations using scanning techniques at 10 min intervals were conducted. Feed intake, bodyweight and feather score were also measured. There was no significant difference in aggression before and after decreasing the light in all three housing systems. On the other hand, the proportion of birds showing aggression decreased significantly just after trimming and four weeks after beak trimming in the furnished cages (P < 0.05 and P < 0.01, respectively). The aggression also became similar to the proportions observed in the battery cages and in the aviary. In proportion to the decreased aggression, the proportion of birds eating significantly decreased (P < 0.05). However, their feed intake and bodyweight did not decrease significantly. Against this decreased aggression, the proportion of birds preening significantly increased (P < 0.05). Aggression was observed more frequently at the dust bath in the furnished cages and at the litter floor in the aviary (both P < 0.001). The total feather score for all body parts in the birds in furnished cages increased significantly (P < 0.01) from 25 to 29 weeks of age (at beak trimming), but did not increase significantly from 29 to 33 weeks of age. The increments of neck, breast and tail feather scores in the furnished cages were smaller. In conclusion, there was no significant difference in aggression between just before and after decreasing the light in any housing system. However, aggression in the furnished cages was reduced not only by decreasing the light intensity, but by additional beak trimming. Aggravation of feather conditions – especially at the neck, breast and back – was prevented by the treatment.