Oliveira Carlos Eduardo Alves, Tinôco Ilda de Fátima Ferreira, Damasceno Flávio Alves, Oliveira Victor Crespo de, Ferraz Gabriel Araújo E Silva, Sousa Fernanda Campos de, Andrade Rafaella Resende, Barbari Matteo
Department of Agricultural Engineering, Federal University of Viçosa (UFV), Viçosa 36570-900, MG, Brazil.
Department of Engineering, Federal University of Lavras (UFLA), Lavras 37200-900, MG, Brazil.
Animals (Basel). 2022 Aug 12;12(16):2055. doi: 10.3390/ani12162055.
The objective of this study was to evaluate and characterize the dependence and the spatial and temporal distribution of variables and indices of the thermal environment in an open compost-bedded pack barn system with positive-pressure ventilation (CBPPV) during the winter period. The study was conducted in a CBPPV system located in the Zona da Mata region, Minas Gerais, Brazil. The indoor environment was divided into a mesh composed of 55 equidistant points, where data on dry-bulb air temperature (t) and relative humidity (RH) were collected. The collected data were divided into four periods-dawn, morning, afternoon, and night-and mean values were obtained. To evaluate the thermal microenvironment, the temperature and humidity index (THI) and the specific enthalpy of air () were used. For spatial dependence analysis, geostatistical techniques were applied. Through the results, a strong spatial dependence was verified for all variables evaluated. Through THI and maps, conditions of thermal comfort were found for dairy cattle. The highest values of t, THI, and were recorded in the afternoon period in the northwest region of the facility (t = 23.2 °C, THI = 69.7, and = 50.9 kJ∙kg of dry air).
本研究的目的是评估和描述冬季期间具有正压通风的开放式堆肥垫料牛舍系统（CBPPV）中热环境变量和指标的相关性以及时空分布。该研究在巴西米纳斯吉拉斯州马塔地区的一个CBPPV系统中进行。室内环境被划分为由55个等距点组成的网格，在这些点收集干球气温（t）和相对湿度（RH）数据。收集到的数据被分为四个时段——黎明、上午、下午和夜间——并得出平均值。为了评估热微环境，使用了温度湿度指数（THI）和空气比焓（）。对于空间相关性分析，应用了地统计技术。通过结果验证了所有评估变量都具有很强的空间相关性。通过THI和地图，发现了奶牛的热舒适条件。在设施的西北地区，下午时段记录到t、THI和的最高值（t = 23.2°C，THI = 69.7，= 50.9 kJ∙kg干空气）。
