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Mascarenhas NMH, Furtado DA, Fonsêca VDFC, de Souza BB, de Oliveira AG, Leal Morais FT, Silva RDS, Silva MRD, Batista LF, Dornelas KC, Bezerra CVDC, Costa Silva JAPD. Thermal stress index for native sheep. J Therm Biol 2023; 115:103607. [PMID: 37352597 DOI: 10.1016/j.jtherbio.2023.103607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 04/25/2023] [Accepted: 05/25/2023] [Indexed: 06/25/2023]
Abstract
The first objective of this study was to develop a thermal stress index for sheep based on environmental and animal data collected in a climate chamber under various environmental conditions. The second objective was to compare published indices of thermal comfort and the proposed index, testing them with the data from this study, with the objective of pointing out the most adequate index to be used by breeders when choosing management procedures. A total of 3024 data were obtained for the physiological variables of the sheep exposed to the eight thermal conditions in the climatic chamber and in ambient condition, kept three days in each thermal condition. A principal component analysis summarized the measurements of physiological variables into only one variable (y1). Using SigmaPlot software, multiple regression of y1 with the environmental variables and their combinations produced a number of indices. The equation chosen was the heat stress index for sheep, TSI = 24.153 - (0.0523*AT) + (0.746*BGT) + (4.104*Vp), with R2 = 0.668. The correlations presented high values, where these correlation values were assumed to indicate the efficiency of each index as indicators of the animals' response to the environment. Thus, it was assumed that the TSI presents a high efficiency.
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Affiliation(s)
- Nágela Maria Henrique Mascarenhas
- Postgraduate Program in Agricultural Engineering, Department of Agricultural Engineering, Federal University of Campina Grande (UFCG), Rua Aprígio Veloso, 882 - Universitário, Campina Grande, PB, 58429-900, Brazil.
| | - Dermeval Araújo Furtado
- Postgraduate Program in Agricultural Engineering, Department of Agricultural Engineering, Federal University of Campina Grande (UFCG), Rua Aprígio Veloso, 882 - Universitário, Campina Grande, PB, 58429-900, Brazil
| | | | - Bonifácio Benício de Souza
- Postgraduate Program in Veterinary Medicine, Department of Veterinary Medicine, Federal University of Campina Grande (UFCG), Avenue Universitária, s/n - Santa Cecilia, Patos, PB, 58708-110, Brazil
| | - Airton Gonçalves de Oliveira
- Postgraduate Program in Agricultural Engineering, Department of Agricultural Engineering, Federal University of Campina Grande (UFCG), Rua Aprígio Veloso, 882 - Universitário, Campina Grande, PB, 58429-900, Brazil
| | - Fabiana Teresinha Leal Morais
- Postgraduate Program in Agricultural Engineering, Department of Agricultural Engineering, Federal University of Campina Grande (UFCG), Rua Aprígio Veloso, 882 - Universitário, Campina Grande, PB, 58429-900, Brazil
| | - Ricardo de Sousa Silva
- Postgraduate Program in Agricultural Engineering, Department of Agricultural Engineering, Federal University of Campina Grande (UFCG), Rua Aprígio Veloso, 882 - Universitário, Campina Grande, PB, 58429-900, Brazil
| | - Maycon Rodrigues da Silva
- Postgraduate Program in Veterinary Medicine, Department of Veterinary Medicine, Federal University of Campina Grande (UFCG), Avenue Universitária, s/n - Santa Cecilia, Patos, PB, 58708-110, Brazil
| | - Luanna Figueiredo Batista
- Postgraduate Program in Veterinary Medicine, Department of Veterinary Medicine, Federal University of Campina Grande (UFCG), Avenue Universitária, s/n - Santa Cecilia, Patos, PB, 58708-110, Brazil
| | - Karoline Carvalho Dornelas
- Postgraduate Program in Agricultural Engineering, Department of Agricultural Engineering, Federal University of Campina Grande (UFCG), Rua Aprígio Veloso, 882 - Universitário, Campina Grande, PB, 58429-900, Brazil; Federal University of the Mato Grosso (UFMT), Avenue Alexandre Ferronato, 1200 - Res. Cidade Jardim, Sinop, MT, 78550-728, Brazil
| | - Carlos Vailan de Castro Bezerra
- Postgraduate Program in Agricultural Engineering, Department of Agricultural Engineering, Federal University of Campina Grande (UFCG), Rua Aprígio Veloso, 882 - Universitário, Campina Grande, PB, 58429-900, Brazil
| | - José Antonio Pires da Costa Silva
- Postgraduate Program in Veterinary Medicine, Department of Veterinary Medicine, Federal University of Campina Grande (UFCG), Avenue Universitária, s/n - Santa Cecilia, Patos, PB, 58708-110, Brazil
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