Thermal environment in mobile shelters with different cover types used for chicken housing at the semi-extensive rearing
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ORIGINAL PAPER
Thermal environment in mobile shelters with different cover types used for chicken housing at the semi-extensive rearing system Roberta Passini 1 & Eduardo Alves de Almeida 2 Sheila Tavares Nascimento 3
&
Sarah Cristine Martins Neri 1 & Luana Alves Akamine 1 &
Received: 30 October 2019 / Revised: 10 July 2020 / Accepted: 30 July 2020 # ISB 2020
Abstract 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. Keywords Rural buildings . Ambience . Thermal insulated . Artificial shading . Welfare
Introduction Poultry farming takes a prominent position in the animal protein market, with approximately 95 million tons of world’s chicken production in 2018 (ABPA 2019), with forecast production of 98.4 million tons in 2019, equivalent to an
* Roberta Passini [email protected] 1
Campus of Exact and Technological Sciences, State University of Goiás, Anápolis, Goiás, Brazil
2
Studies Institute of Humid Tropic, Federal University of South and Southwest of Pará, Xinguara, Pará, Brazil
3
Faculty of Agronomy and Veterinary Medicine, University of Brasilia, Brasilia, Federal District, Brazil
approximate increase of 3% over the previous year (USDA 2019). In Brazil poultry farming is an important part
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