Data/hora: 25/06/2024 06:36:23

Biblioteca(s): 	Embrapa Meio Ambiente.	
Data corrente: 	21/07/2021	
Data da última atualização: 	21/07/2021	
Autoria: 	KARVATTE JUNIOR, N.; MIYAGI, E. S.; OLIVEIRA, C. C. de; MASTELARO, A. P.; COELHO, F. de A.; SILVA, G. B. S. da; BUNGENSTAB, D. J.; ALVES, F. V.	
Afiliação: 	NIVALDO KARVATTE JUNIOR, UFG; ELIANE SAYURI MIYAGE, UFG; CAROLINE CARVALHO DE OLIVEIRA, UFMS; ARIADNE PEGORARO MASTELARO, UFPR; FLÁVIO DE AGUIAR COELHO, UFMS; GUSTAVO BAYMA SIQUEIRA DA SILVA, CNPMA; DAVI JOSE BUNGENSTAB, CNPGC; FABIANA VILLA ALVES, CNPGC.	
Título: 	Spatiotemporal variations on infrared temperature as a thermal comfort indicator for cattle under agroforestry systems.	
Ano de publicação: 	2021	
Fonte/Imprenta: 	Journal of Thermal Biology, v. 97, article 102871, 2021.	
ISSN: 	0306-4565	
DOI: 	https://doi.org/10.1016/j.jtherbio.2021.102871	
Idioma: 	Inglês	
Conteúdo: 	Abstract: With the expanding use of thermal assessment techniques in beef cattle, infrared thermography has become a promising tool for assessing the environment for animal thermal comfort. Goals of this study were: (1) to evaluate cattle thermal comfort in agroforestry systems with different shade availability (2) to verify the spatiotemporal variations of infrared temperature inside agroforestry systems, and; (3) to test infrared thermography as a potential tool to assess animal thermal comfort indices in agroforestry systems. A trial was carried out between June 2015 and February 2016, covering Central-Brazil's dry winter and rainy summer seasons, respectively. The experimental area of Embrapa Beef Cattle is located in Campo Grande (Mato Grosso do Sul), coordinates 20º24'53" S, 54º42'26" W and 558 m altitude. The 12 ha plot has two agroforestry systems varying shade availability. Traditional Black Globe Temperature and Humidity Index, Heat Load Index and Radiation Thermal Load were determined, from measurements using digital thermo-hygrometers, with datalogger. Surface temperature and humidity of tree canopies and pasture were determined using an infrared thermographic camera. Results show spatiotemporal variations in infrared temperature. This means that the environment inside agroforestry systems is not homogeneously comfortable for cattle, and the system with the lowest shade availability has the greatest heat accumulation area. Weak to strong associations were identified between infrared variables and thermal comfort indices (0.08 = r <= 0.75). Positive relationships were also obtained and equally well explained by the Black Globe Temperature and Humidity Index and Heat Load Index (0.55 = R2 <= 0.94). We conclude that infrared thermography can be used as a tool to assess thermal comfort indices in agroforestry systems and to determine onset of animal thermal stress from environment and heat body accumulation.	
Palavras-Chave: 	Thermal comfort indices.	
Thesagro: 	Agrossilvicultura; Gado de Corte.	
Thesaurus Nal: 	Agroforestry; Animal comfort; Beef cattle; Environmental monitoring; Geostatistics; Shade agroforestry systems; Thermography; Thermoregulation.	
Categoria do assunto: 	X Pesquisa, Tecnologia e Engenharia	
Registro original: 	Embrapa Meio Ambiente (CNPMA)	
Exemplares: 	CNPMA - (16994-1) - UPC - AP - DD -  -  -  - DIS