Black Globe-Humidity Index (BGHI) as Comfort Equation for Dairy Cows

Buffington, D. E.; Collazo-Arocho, A.; Canton, G. H.; Pitt, David

doi:10.13031/2013.34325

Cited by 782 publications

(566 citation statements)

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“…The devices were installed in the center of each facility and, based on the obtained data, the temperaturehumidity index (THI) was calculated through the equation proposed by Bunffington et al (1997).…”

Section: Methodsmentioning

confidence: 99%

Thermal comfort index, physiological variables and performance of quails fed with protein reduction

Rodrigues

Furtado

Costa

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objective of this study was to determine the effects of environment and electrolyte balance on environmental, physiological and productive indices of Japanese quails. For the experiment, 288 quails were distributed in a randomized block design with six treatments and six replicates of eight birds per experimental unit. The treatments consisted of one basal feed with 20.0% of crude protein (CP) and the others with a reduction of 3.0% CP to achieve six electrolyte balance levels (166.54; 153.47; 139.63; 139.63; 117.13 and 166.49). As to the environment, there was an increase in air temperature and temperature-humidity index at the hottest hours of the day, causing discomfort to the birds, which increased respiratory rate, but with the maintenance of homeothermy. Differences were observed in feed consumption, water consumption, production, weight of eggs and mass of eggs, due to the electrolyte levels in the feed. For feed conversion, both per mass and per dozen of eggs, there was no statistical difference. The electrolyte balance and environmental indices at the hottest hours of the day did not affect quail production.Índice de conforto térmico, variáveis fisiológicas e desempenho de codornas alimentadas com redução proteica R E S U M O Objetivou-se, neste trabalho, determinar o efeito do ambiente e do balanço eletrolítico sobre os índices ambientais, fisiológicos e produtivos de codornas japonesas. Utilizaram-se 288 aves distribuídas no delineamento em blocos casualizados com seis tratamentos e seis repetições de oito aves por unidade experimental. Os tratamentos consistiram em uma ração basal com nível de 20,0% PB e os demais com redução de 3,0% PB, para alcançar seis níveis de balanço eletrolítico (166,54; 153,47; 139,63; 139,63; 117,13 e 166,49). Quanto ao ambiente, verificou-se uma elevação na temperatura do ar e no índice de temperatura e umidade nos horários mais quentes do dia, causando desconforto às aves, que elevaram a frequência respiratória, porém com a manutenção da homeotermia. Foram observadas diferenças no consumo de ração, consumo de água, produção, peso e massa de ovo, em razão dos níveis eletrolíticos da ração. Quanto à conversão alimentar tanto por massa quanto por dúzia de ovos, não foi observada diferença estatística. O balanço eletrolítico e os índices ambientais nos horários mais quentes do dia não interferiram na produção das aves.

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Section: Methodsmentioning

confidence: 99%

Thermal comfort index, physiological variables and performance of quails fed with protein reduction

Rodrigues

Furtado

Costa

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…Durante a fase experimental foram coletadas no interior das instalações as variáveis ambientais: temperatura máxima (T máx ), temperatura mínima (T mín ), temperatura do bulbo seco (Tbs), temperatura do bulbo úmido (Tbu), temperatura do globo negro (Tgn) e determinado o índice de temperatura do globo e umidade (ITGU) e umidade relativa do ar (UR). O ITGU foi calculado pela fórmula ITGU = Tgn + 0,36 (Tpo) + 41,5 (BUFFINGTON et al, 1981).…”

Section: Methodsunclassified

Temperatura superficial e índice de tolerância ao calor de caprinos de diferentes grupos raciais no semi-árido nordestino

Souza

Cézar

et al. 2008

Ciênc. agrotec.

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Objetivou-se com este trabalho determinar a temperatura superficial e o índice de tolerância ao calor de caprinos (F1) resultantes de cruzamentos entre as raças Boer, Savana, Kalahari, Anglo Nubiana e Moxotó, com caprinos SRD, da região Nordeste. Foram utilizados 30 caprinos inteiros, com idade média de seis meses e peso médio de 25,17kg, sendo seis de cada grupo genético: ½Boer + ½SRD (BS), ½Anglo-Nubiana + ½SRD (ANS), ½Savana + ½SRD (SS), ½Kalarari + ½SRD (KS) e ½Moxotó + ½SRD (MS), mantidos em regime de confinamento. Os parâmetros estudados foram a temperatura superficial e o índice de tolerância ao calor (ITC). Verificou-se que os grupos raciais apresentaram diferença significativa para a temperatura superficial, todavia o ITC foi semelhante para todos. Assim a utilização desses grupos raciais para incrementar a produtividade caprina no semi-árido pode ser aconselhada.

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“…To characterise the thermal environment, the black globe and dry bulb temperatures and the relative humidity were recorded twice daily, in the morning (8:00 a.m.) and the afternoon (2:00 p.m.) at 0.4 m from the floor, during the entire experimental period, using a black globe thermometer and an analog thermo-hygrometer, respectively. The black globe temperature and humidity index (BGTHI) was calculated using the equation proposed by Buffington et al (1981). Statistical analysis was applied to the environmental data, performance and physiological variables (RT), RF and skin surface temperature (ST) adopting the Scott-Knott test at 5% significance level.…”

Section: Methodsmentioning

confidence: 99%

Assessing the Most Suitable Floor System for Growing-Finishing Piggery Under Tropical Conditions Using the Analytic Hierarchy Process

Caldara

Garcia

Paz

et al. 2014

Italian Journal of Animal Science

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Studies were carried out worldwide for evaluating different types of floor systems for growing-finishing pigs, specifically for assessing their effectiveness on pig performance, health and behaviour, leaving the opportunity for using multi-criteria analysis in decisionmaking towards the selection of flooring type. This study aimed to select the most suitable floor system for growing-finishing pigs under tropical conditions, considering performance traits and farmers management aspects. The analytic hierarchy process was applied for seeking the best solution considering both the farmers' goals and the pigs' welfare. Aspects considered in the analysis were: economic feasibility, rearing thermal and aerial condition, animal behaviour, performance, and health status. The input used in the calculation was based on the results of a field trial using three treatments: whole concrete floor, coffee and rice husk bedding, and wood shavings deepbedding. Rearing conditions and pigs' physiological parameters, performance, behaviour, and health status were analysed. When the floor system was considered, the most significant criteria were economic feasibility (0.31) and overall pig performance (0.31) leading to a final deep-bedding selection ranking of coffee and rice husks (1 st ), concrete floor (2 nd ), and wood shavings (3 rd ). Conversely, when the animal welfare was considered, the most decisive criterion was health status (0.32), followed by physiological parameters (0.25), and behaviour (0.23) leading to a final bedding selection ranking of coffee and rice husks (1 st ), wood shavings (2 nd ), and concrete floor (3 rd ). Results indicate that the deep-bedding of coffee and rice husks provided the best choice for both the farmer and the growing-finishing pigs.

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Black Globe-Humidity Index (BGHI) as Comfort Equation for Dairy Cows

Cited by 782 publications

References 0 publications

Thermal comfort index, physiological variables and performance of quails fed with protein reduction

Thermal comfort index, physiological variables and performance of quails fed with protein reduction

Temperatura superficial e índice de tolerância ao calor de caprinos de diferentes grupos raciais no semi-árido nordestino

Assessing the Most Suitable Floor System for Growing-Finishing Piggery Under Tropical Conditions Using the Analytic Hierarchy Process

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