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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Animal thermal comfort indexes in silvopastoral systems with different tree arrangements

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Macedo Pezzopane, Jose Ricardo [1] ; Franceschi Nicodemo, Maria Luiza [1] ; Bosi, Cristiam [2] ; Garcia, Alexandre Rossetto [1] ; Lulu, Jorge [3]
Total Authors: 5
[1] Embrapa Pecuaria Sudeste, Empresa Brasileira Pesquisa Agr, POB 339, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil
[3] Embrapa Agrossilvipastoril, Empresa Brasileira Pesquisa Agr, Rod Pioneiros MT 222, Km 2, 5, POB 343, BR-78550970 Sinop, MT - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Thermal Biology; v. 79, p. 103-111, JAN 2019.
Web of Science Citations: 5

This study aimed to assess solar radiation transmission and animal thermal comfort indexes in two silvopastoral systems established with different tree arrangements in a tropical region. This study was conducted between 2014 and 2017 in two silvopastoral systems, one composed by an established Urochloa (syn. Brachiaria) decumbens pasture with Brazilian native trees planted in triple rows spaced 17 m apart, and another by an established Urochloa (syn. Brachiaria) brizantha (Hochst ex A. Rich.) Stapf %RS Plata' pasture with Eucalyptus urograndis (clone GG100) trees arranged in single rows spaced 15 m apart. In these systems and in a full-sun pasture, photosynthetically active radiation transmission, air temperature, relative humidity, black globe temperature, and wind speed were measured. These variables were used to calculate black globe temperature and humidity index (BGHI) and radiant thermal load (RU). Higher animal thermal comfort was observed in the silvopastoral systems due to changes in the microclimate induced by the trees; notably, a decrease in solar radiation transmission. Fewer hours of potential animal thermal stress (BGHI > 79) were observed in the silvopastoral systems than under the full-sun conditions, with differences up to 3 h per day. The silvopastoral systems presented lower radiant thermal load than the full-sun pasture with differences up to 22% achieved. The assessed silvopastoral systems may help livestock adapt to climate change, since they achieved the limit of BGHI considered to cause stress to animals following an increase of 2.2 degrees C in air temperature, compared with full-sun pastures. (AU)

FAPESP's process: 15/26627-5 - Reproductive performance of beef cattle females (Bos taurus x Bos indicus) in intensive grazing areas with or without the presence of trees
Grantee:Alexandre Rossetto Garcia
Support type: Regular Research Grants
FAPESP's process: 16/02959-1 - Eucalyptus thinning in integration Crop-Livestock-Forest system: effects on microclimate and productivity
Grantee:José Ricardo Macedo Pezzopane
Support type: Regular Research Grants
FAPESP's process: 14/11931-8 - Parameterization and evaluation of mechanistic crop simulation models to estimate Urochloa brizantha cv. Piatã productivity in a silvopastoral system
Grantee:Cristiam Bosi
Support type: Scholarships in Brazil - Doctorate