Impact of temperature-humidity index on heat stress behavior and welfare of battery-caged yellow-feathered native broilers during summertime in Hong Kong: An observational study

IF 2.9 2区 生物学 Q2 BIOLOGY
Theethawat Uea-Anuwong , Yi Kei Lam , Denis Yau , Cheuk Ming Li , Chen Xin , Surya Paudel , Anne Conan , Dirk Udo Pfeiffer , Ákos Kenéz
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Abstract

This observational study investigated the effects of the temperature-humidity index (THI) on heat stress behavior, hormonal response, and body temperature of battery-caged yellow-feathered broilers on a Hong Kong poultry farm equipped with ventilation fans and foggers from August to September 2023. Twenty-six units distributed in the sidewall and inner zones of the chicken house were randomly selected for real-time THI measurement using data loggers. Each unit comprised six cages with three birds each. All chickens in the selected cages were scored for heat stress behaviors (n = 468). The body temperature and live weight of one randomly selected chicken per cage were measured on days 72 and 90 of age (n = 156). Two broilers per unit were randomly selected for blood corticosterone (n = 52). Although the sidewall zones were more exposed to sunlight than the inner zones, the data loggers showed no difference in the THI between these zones. Forty-five out of 468 chickens (9.6 %, 95 % CI 44.97–45.03) exhibited high heat stress behavior under high THI conditions. The THI and the zones showed no statistically significant associations with our observations of heat stress behavior and body weight change. The serum corticosterone levels of individual broilers measured in the afternoon were consistently lower than those measured in the morning; however, no significant difference was detected between the different zones of the house. In conclusion, the relatively small proportion of birds exhibiting heat stress behavior suggests that the native yellow-feathered broilers had considerable adaptive capacity to tolerate the hot and humid climate during summer in Hong Kong.
温湿指数对香港笼养黄羽肉鸡夏季热应激行为和福利的影响
本研究于2023年8月至9月在香港某家禽养殖场研究了温湿度指数(THI)对电笼黄羽肉鸡热应激行为、激素反应和体温的影响。随机选择分布在鸡舍侧壁和内部区域的26个单元,使用数据记录仪进行实时THI测量。每个单元由六个笼子组成,每个笼子里有三只鸟。对所选笼中所有鸡进行热应激行为评分(n = 468)。在72日龄和90日龄时,每笼随机选取1只鸡(n = 156)测定体温和活重。每单位随机选取2只肉仔鸡进行血皮质酮试验(n = 52)。虽然侧壁区域比内部区域更多地暴露在阳光下,但数据记录器显示这些区域之间的THI没有差异。468只鸡中45只(9.6%,95% CI 44.97 ~ 45.03)在高THI条件下表现出高热应激行为。THI和区域与我们观察到的热应激行为和体重变化没有统计学上的显著关联。肉鸡个体血清皮质酮水平在下午持续低于上午;然而,在房子的不同区域之间没有发现显著的差异。综上所述,黄羽肉鸡表现出热应激行为的比例相对较小,说明本地黄羽肉鸡对香港夏季湿热气候具有相当的适应能力。
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来源期刊
Journal of thermal biology
Journal of thermal biology 生物-动物学
CiteScore
5.30
自引率
7.40%
发文量
196
审稿时长
14.5 weeks
期刊介绍: The Journal of Thermal Biology publishes articles that advance our knowledge on the ways and mechanisms through which temperature affects man and animals. This includes studies of their responses to these effects and on the ecological consequences. Directly relevant to this theme are: • The mechanisms of thermal limitation, heat and cold injury, and the resistance of organisms to extremes of temperature • The mechanisms involved in acclimation, acclimatization and evolutionary adaptation to temperature • Mechanisms underlying the patterns of hibernation, torpor, dormancy, aestivation and diapause • Effects of temperature on reproduction and development, growth, ageing and life-span • Studies on modelling heat transfer between organisms and their environment • The contributions of temperature to effects of climate change on animal species and man • Studies of conservation biology and physiology related to temperature • Behavioural and physiological regulation of body temperature including its pathophysiology and fever • Medical applications of hypo- and hyperthermia Article types: • Original articles • Review articles
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