Barn production systems in Australia are either an indoor-housing floor system or an aviary system with multilevel structures, equipped with nesting boxes, perches and feeding and watering systems. These systems offer hens the freedom of movement and an opportunity to display a repertoire of favourable behaviours as well as interact with complex housing elements as compared with caged systems. However, the system can create prospects for the hens to express detrimental behaviours such as feather pecking and cannibalism. Other aspects of welfare that may be compromised when compared with cage systems include incidence of fractures and injuries during navigation of hens among elements of housing that may result in collision or falls. Barn production systems may have an advantage over free-range production systems in relation to the protection they offer from predators and predator stress, and diseases and parasites that can be contracted from range areas. Barn systems also offer better biosecurity due to lack of direct access to wild birds and their faeces. The aim of the present review is to assess the welfare status of birds housed in barn (and aviary) production systems, while considering husbandry factors that affect welfare outcomes, the health and disease implications and sustainability. To maintain a high welfare outcome in barn production systems, it is important to keep the enclosed environmental conditions optimum by managing air quality, ventilation and lighting within sheds. Sustainability of these production systems depends on consumer preference, cost of production, environmental footprint and suitable genetics of hens.

中文翻译：

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对谷仓（和鸟舍）产蛋系统的福利影响

澳大利亚的谷仓生产系统要么是室内鸡舍地板系统，要么是具有多层结构的鸟舍系统，配备有巢箱、栖木以及喂食和浇水系统。与笼养系统相比，这些系统为母鸡提供了活动自由和展示良好行为以及与复杂的鸡舍元素互动的机会。然而，该系统可以为母鸡创造诸如啄羽和同类相食等有害行为的机会。与笼养系统相比，福利的其他方面可能会受到影响，包括在可能导致碰撞或跌倒的鸡舍元素之间导航期间发生骨折和受伤的发生率。谷仓生产系统可能比自由放养生产系统更具优势，因为它们可以提供保护，免受捕食者和捕食者压力，以及可以从牧场地区感染的疾病和寄生虫。由于无法直接接触野生鸟类及其粪便，谷仓系统还提供了更好的生物安全性。本综述的目的是评估饲养在谷仓（和鸟舍）生产系统中的鸟类的福利状况，同时考虑影响福利结果、健康和疾病影响以及可持续性的饲养因素。为了在谷仓生产系统中保持高福利结果，重要的是通过管理棚屋内的空气质量、通风和照明来保持封闭的环境条件最佳。这些生产系统的可持续性取决于消费者的偏好，