In tropical climate countries, animal production faces a huge challenge, being the high solar irradiation levels an important factor that negatively influences the welfare and animal performance. The purpose of this research was to check the environment inside mobile shelters with different kinds of cover materials. This research has been developed at the State University of Goiás, Brazil, being used four different cover materials: DFPC, double-faced plastic canvas; PVC, polyvinyl chloride; VFB, tiles made with vegetable fiber and bitumen; and VFBW, tiles made with vegetable fiber and bitumen being the outer face painted white. Covers were placed up mobile shelters with the following dimensions: 1 m length × 1 m width × 1 m height and cover pitch of 30°. The environment was evaluated through thermal comfort indexes: enthalpy (H), temperature and humidity index (THI), black globe and humidity index (BGHI), mean radiant temperature (MRT) and thermal heat load (THL), and the measurement of thermal environmental variables (temperature of external (EST) and internal (IST) surface of the cover, dry bulb temperature (Tdb), black globe temperature (Tbg), relative humidity (RH), and wind speedy (WS)). Data analysis was performed using PROC MIXED of SAS® by analysis of variance (ANOVA), followed by the Tukey test, at 5% of significance level. There was observed beneficial effect of the usage of shading, with a decrease in air temperature and thermal comfort indexes when compared with the unshaded environment. The materials presented different thermal behavior, with better results for PVC and VFBW, that presented lower internal (IST) and external surface temperature (EST), in addition to lower black globe temperature, thermal heat load, and black globe and humidity index. PVC and VFBW were the best types of covers evaluated, with significant decreased thermal comfort indexes.

中文翻译：

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半粗养系统鸡舍不同覆盖类型移动棚内热环境

在热带气候国家，动物生产面临巨大挑战，因为高太阳辐射水平是对福利和动物性能产生负面影响的重要因素。这项研究的目的是检查具有不同类型覆盖材料的移动避难所内的环境。这项研究由巴西戈亚斯州立大学开发，使用了四种不同的封面材料：DFPC、双面塑料帆布；PVC、聚氯乙烯；VFB，用植物纤维和沥青制成的瓷砖；和 VFBW，用植物纤维和沥青制成的瓷砖是外表面漆成白色。覆盖物放置在具有以下尺寸的移动避难所上：1 m 长 × 1 m 宽 × 1 m 高，覆盖物间距为 30°。环境通过热舒适指数进行评估：焓（H），温湿度指数（THI）、黑球湿度指数（BGHI）、平均辐射温度（MRT）和热负荷（THL），以及热环境变量（外部温度（EST）和内部温度（IST）的测量）盖表面、干球温度 (Tdb)、黑球温度 (Tbg)、相对湿度 (RH) 和风速 (WS)。使用 SAS® 的 PROC MIXED 通过方差分析 (ANOVA) 进行数据分析，然后在 5% 的显着性水平下进行 Tukey 检验。观察到使用遮阳的有益效果，与未遮阳的环境相比，气温和热舒适指数有所降低。材料表现出不同的热行为，PVC 和 VFBW 的结果更好，表现出较低的内部 (IST) 和外部表面温度 (EST)，除了降低黑球温度、热负荷以及黑球和湿度指数。PVC 和 VFBW 是评估的最佳覆盖类型，热舒适指数显着降低。