Efeito das temperaturas de bulbo seco e de globo negro e do índice de temperatura e umidade, em vacas em produção alojadas em sistema de free-stall

Marcheto, Francine G.; Nääs, Irenilza de Alencar; Salgado, Douglas D’Alessandro; Souza, Silvia Regina Lucas de

doi:10.1590/s1413-95962002000600008

Cited by 7 publications

(6 citation statements)

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“…Among the climatic variables studied, the most important were RH and AT, which can be measured with a simple portable thermohygrometer, and BGT, which indicated the effects of combining dry bulb temperature, RH, solar radiation, and air movement (Marcheto et al 2002), besides providing an indirect measurement of the radiant heat in the environment. Therefore, the so-called effective indices (BCCCIe and BECIe) are more easily applied when compared with the general indices (BCCCIg and BECIg) determined in this research.…”

Section: Discussionmentioning

confidence: 99%

Thermal comfort indices of female Murrah buffaloes reared in the Eastern Amazon

et al. 2015

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The study aimed to develop new and more specific thermal comfort indices for buffaloes reared in the Amazon region. Twenty female Murrah buffaloes were studied for a year. The animals were fed in pasture with drinking water and mineral supplementation ad libitum. The following parameters were measured twice a week in the morning (7 AM) and afternoon (1 PM): air temperature (AT), relative air humidity (RH), dew point temperature (DPT), wet bulb temperature (WBT), black globe temperature (BGT), rectal temperature (RT), respiratory rate (RR), and body surface temperature (BST). The temperature and humidity index (THI), globe temperature and humidity index (GTHI), Benezra's comfort index (BTCI), and Ibéria's heat tolerance index (IHTI) were calculated so they could be compared to the new indices. Multivariate regression analyses were carried out using the canonical correlation model, and all indices were correlated with the physiological and climatic variables. Three pairs of indices (general, effective, and practical) were determined comprising the buffalo comfort climatic condition index (BCCCI) and the buffalo environmental comfort index (BECI). The indices were validated and a great agreement was found among the BCCCIs (general, effective, and practical), with 98.3 % between general and effective a.nd 92.6 % between general and practical. A significant correlation (P < 0.01) was found between the new indices and the physiological and climatic variables, which indicated that these may be used in pairs to diagnose thermal stress in buffaloes reared in the Amazon.

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Section: Discussionmentioning

confidence: 99%

Thermal comfort indices of female Murrah buffaloes reared in the Eastern Amazon

et al. 2015

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“…O valor do ITGU considera os efeitos de temperatura de bulbo seco, de umidade relativa do ar, de radiação solar e de movimentação do ar, uma vez que a temperatura de globo negro, que compõe a fórmula desse índice, indica os efeitos da combinação dessas variáveis meteorológicas (Kelly & Bond, 1971;Marcheto et al, 2002), além de fornecer uma medida indireta do calor radiante do ambiente. Os valores de ITGU são utilizados para avaliar a situação de conforto térmico de animais com a seguinte escala: até 74, conforto; de 74 a 78, alerta; de 79 a 84, perigosa; e acima de 84, emergência .…”

Section: Methodsunclassified

Conforto térmico de búfalas em sistema silvipastoril na Amazônia Oriental

Silva

Araújo

Júnior

et al. 2011

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar o efeito de um sistema silvipastoril no conforto térmico de 20 búfalas Murrah, das quais 10 criadas em piquetes sem sombra (SS) e 10 com sombreamento (CS) de Racosperma mangium, em Belém, PA. Os animais foram alimentados em pasto, com Urochloa humidicola, com acesso livre à água para beber e sal mineral. A cada três dias, foram mensuradas: temperatura do ar (TA), umidade relativa do ar (UR), temperatura de globo negro (TGN), temperatura retal (TR), frequências respiratória (FR) e cardíaca (FC), e a temperatura da superfície corporal (TSC), pela manhã (7h) e à tarde (13h). Os valores de TR, TSC, FR e FC foram maiores à tarde, especialmente no grupo SS. Mais altas no período menos chuvoso, a TR, TSC e FR apresentaram correlação linear positiva com a TA e o índice de temperatura e umidade (ITGU) e negativa com a UR. Tanto na estação mais chuvosa quanto na menos chuvosa, a FC apresentou correlações significativas positivas com a TA e ITGU e negativas com a UR, apenas no período mais chuvoso. A arborização da pastagem é eficiente para melhorar o conforto térmico das búfalas Murrah, principalmente à tarde.Termos para indexação: índice de temperatura e umidade, somreamento, bioclimatologia, Bubalus bubalis, Racosperma mangium, fisiologia. Thermal comfort of female buffaloes in a silvipasture system in the eastern AmazonAbstract -The objective of this work was to evaluate the effects of a silvipasture system on the thermal comfort of 20 female buffaloes, from which 10 raised in under nonshaded paddocks (SS) and 10 in paddocks shaded by Racosperma mangium (CS), in Belém county, PA, Brazil. All animals were fed in pastures with Urochloa humidicola, and had free access to drinking water and mineral salt. Every three days, measurements were made for air temperature (TA), relative humidity (UR), black globe temperature (TGN), rectal temperature (TR), respiratory rate (FR), heart rate (FC), and body surface temperature (TSC), in the morning (7 AM) and in the afternoon (1 PM). The values of TR, TSC, RR and FR, mainly for the SS group, were higher in the afternoon. The TR, TSC and FR showed a significant and positive correlation with TA and the temperature and humidity index (ITGU), and a negative correlation with UR. These correlations were higher for the less rainy period. The FR showed significant and positive correlations with TA and ITGU, during both the most and the less rainy seasons, and negative correlations with UR only in the rainy season. The forestation of pasture areas is efficient to increase the thermal comfort for Murrah females, especially in the afternoon.

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“…Because temperature and humidity have an interactive effect on animals, the THI is generally used to evaluate the thermal environment. However, one study has reported RH, AT, and BGT as the most important factors of thermal environment, which can collectively indicate the overall effects of temperature, relative humidity, solar radiation, and airflow on animals [26]. Therefore, compared to the general index models (E1 and P1), the effective index models (E2 and P2) are relatively easier to record and reflect the thermal comfort of buffalo.…”

Section: Discussionmentioning

confidence: 99%

Thermal Comfort Index for Lactating Water Buffaloes under Hot and Humid Climate

Liang

Tang

et al. 2021

Animals

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Heat stress results in serious performance losses and adversely affects animal health and welfare under various production systems. This study was conducted to develop a thermal comfort model for lactating buffaloes under hot and humid climate. Twenty Nili-Ravi buffaloes were randomly enrolled for this one-year study. Physiological parameters including rectal temperature (RT), respiratory rate (RR), and body surface temperature (BST) and environmental variables such as wet bulb temperature (WBT), dew point temperature (DPT), and black globe temperature (BGT) were recorded twice a week on each Tuesday and Thursday (n = 1602 and 1560, respectively) at 8:00 am and 2:30 pm. Moreover, ambient temperature (AT, °C) and relative humidity (RH, %), at an interval of every 30 min were recorded. We used a typical correlation analysis to build the index models for thermal comfort. The results revealed that AT positively correlated with BGT, WBT, DPT, BST, RT, and RR, while RH negatively correlated with RT. Moreover, a physiological index model consisting of BST, RT and RR (P1 = 0.578 × BST + 0.047 × RT + 0.429 × RR) and an environmental index model (E1 = 0.881 × AT + 0.194 × RH + 0.455 × BGT − 0.347 × WBT + 0.032 × DPT) proved to be a more accurate index as a pair to reveal the state of thermal comfort in lactating buffaloes. Moreover, these models correlated well with physiological variables, indicating that this this pair of index models can be used to effectively evaluate the thermal comfort in buffaloes.

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Efeito das temperaturas de bulbo seco e de globo negro e do índice de temperatura e umidade, em vacas em produção alojadas em sistema de free-stall

Cited by 7 publications

References 1 publication

Thermal comfort indices of female Murrah buffaloes reared in the Eastern Amazon

Thermal comfort indices of female Murrah buffaloes reared in the Eastern Amazon

Conforto térmico de búfalas em sistema silvipastoril na Amazônia Oriental

Thermal Comfort Index for Lactating Water Buffaloes under Hot and Humid Climate

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