Impact of global warming on beef cattle production cost in Brazil

Nääs, Irenilza de Alencar; Romanini, Carlos Eduardo Bites; Salgado, Douglas D’Alessandro; Lima, Karla Andréa Oliveira de; Vale, Marcos Martinez do; Labigalini, Marcelo Ricardo; Souza, Silvia Regina Lucas de; Menezes, Adriana Gomes de; Moura, Daniella Jorge de

doi:10.1590/s0103-90162010000100001

Cited by 22 publications

(12 citation statements)

References 20 publications

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“…The high temperature might cause mortality in birds according to their exposure to high temperatures reaching hyperthermia, a high body temperature condition leading to respiratory alkalosis and increasing blood pH due to excessive panting, causing the death of the birds (JULIAN, 2005;TOYOMIZU et al, 2005;ABIDIN & KHATOON, 2013). The climate change and heat waves events are responsible for severe production losses in broiler facilities NÄÄS et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Effect of a simulated heat wave in thermal and aerial environment broiler-rearing environment

et al. 2016

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Global warming increases the occurrence of events such as extreme heat waves. Research on thermal and air conditions affecting broiler-rearing environment are important to evaluate the animal welfare under extreme heat aiming mitiga tion measures. This study aimed at evaluating the effect of a simulated heat wave, in a climatic chamber, on the thermal and air environment of 42-day-old broilers. One hundred and sixty broilers were housed and reared for 42 days in a climatic chamber; the animals were divided into eight pens. Heat wave simulation was performed on the 42 nd day, the period of great impact and data sampling. The analyzed variables were room and litter temperatures, relative humidity, concentrations of oxygen, carbon monoxide and ammonia at each pen. These variables were assessed each two hours, starting at 8 am, simulating a day heating up to 4 pm, when it is reached the maximum temperature. By the results, we concluded that increasing room temperatures promoted a proportional raise in litter temperatures, contributing to ammonia volatilization. In addition, oxygen concentrations decreased with increasing temperatures; and the carbon monoxide was only observed at temperatures above 27.0 °C, relative humidity higher than 88.4% and litter temperatures superior to 30.3 °C.KEYWORDS: ammonia, gas production, animal welfare, oxygen, litter temperature ONDA DE CALOR SIMULADA E SEU IMPACTO NO AMBIENTE TÉRMICO E AÉREO DE FRANGOS DE CORTE RESUMO:O aquecimento global aumenta a ocorrência de eventos extremos como as ondas de calor. Pesquisas sobre como as condições térmicas e aéreas afetam o ambiente de produção de frangos de corte são importantes para se avaliar o bem-estar animal sob condições extremas de calor, objetivando medidas mitigadoras. Este estudo pretende avaliar o efeito da simulação de ondas de calor em câmara climática, sobre o ambiente térmico e aéreo de frangos de corte com 42 dias de idade. 160 frangos foram alojados e criados, de 1 a 42 dias de idade, em câmara climática que foi dividida em oito baias. A simulação de onda de calor foi realizada no 42º dia de criação das aves, memento de maior impacto e da coleta dos dados. As variáveis foram coletadas em intervalos de duas horas a partir das 8 horas da manhã, simulando o aquecimento do dia até às 16 horas, horário de máxima, sendo coletados temperatura ambiente, temperatura da cama, umidade relativa do ar, concentrações de oxigênio, monóxido de carbono e amônia em cada baia, nos intervalos de duas em duas horas. Com os resultados obtidos na câmara climática, foi possível concluir que o aumento da temperatura ambiente ocasionou aumento na temperatura da cama, o que, consequentemente, contribuiu para o aumento da volatilização da amônia. A concentração de oxigênio foi reduzida enquanto a temperatura foi aumentada. A presença de monóxido de carbono foi observada quando a temperatura ambiente estava acima de 27,0 ºC, a umidade relativa superior a 88,4% e a temperatura da cama estava superior a 30,3 ºC. PALAVRAS-CHAVE:amônia, bem-estar an...

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Section: Introductionmentioning

confidence: 99%

Effect of a simulated heat wave in thermal and aerial environment broiler-rearing environment

et al. 2016

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“…Considerably increased costs can result from the reduced pasture production, e.g. due to the climatic changes (Nääs et al 2010). The total costs per 1 feeding day as determined in this study were by 11 CZK higher than those reported by Boudný and Janotová (2012) for 2010.…”

Section: Total Costs and Their Variabilitymentioning

confidence: 99%

Economic efficiency of suckler cow herds in the Czech Republic

Syrůček¹,

Kvapilík²,

Bartoň³

et al. 2017

AGR ECON-CZECH

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Th e objective of the study was to assess the profi tability of suckler cow herds located in diff erent regions of the Czech Republic. Data on 2164 suckler cows were collected for 2013 from 20 beef farms using a questionnaire and the covered production, reproduction, and economic traits. Model calculations were used to determine the level of profi tability with support payments either included (2.15%) or excluded (−45.5%). Break-even points defi ned as the points when the operation reaches zero profi tability were estimated for the number of calves weaned and sold (81 calves/100 cows) and for the selling price of calves (54.6 CZK/kg). Fixed cost as a proportion of the total costs was reduced with the increasing herd size. Based on the results of a sensitivity analysis, the selling price for calves, the number of calves weaned the calving interval, and the amount of support payments were identifi ed as the factors with the highest impact on the overall herd profi tability.

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“…7b) [26][27][28]. If no precaution is taken, there might occur the migration of plant production to regions in order to achieve better thermal environment [29].…”

Section: Prediction Of Evaporative Cooling Efficiency For Future Scenmentioning

confidence: 99%

Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates

Damasceno¹,

Mendes²,

Yanagi³

et al. 2017

DYNA

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The main objective of this study was to experimentally validate a mechanistic model for predicting the cooling efficiency (η) of wetted porous plates built with expanded clay. The expanded clay material was physically characterized by specific mass, surface area, and volume. The model was validated with dry bulb temperature (Tdb, °C) and air relative humidity (RH, %) data, which were continuously monitored in two different points, upstream and downstream the direction of the air passing through the porous plate. Data collection was carried out consecutively for a period of 10 days, between 11:00 a.m. and 4:00 p.m. Average values for η, simulated and observed, were 74.8 ± 7.4% and 68.3 ± 8.3%, respectively. Based on the developed model, it was observed that η was higher than 40% for Tdb > 30 °C and constant RH at 45%. The simulation for predictions indicates that the increase in the air temperature greater than 20 °C may affect negatively the production in greenhouses from states located in tropical and subtropical countries as Minas Gerais, Brazil, if some design criteria in the evaporative cooling system are not revised.Keywords: Greenhouse; mathematical modeling; simulation; heat and mass transfer.Evaluación de la eficiencia de equipos de enfriamiento evaporativo usando placas porosas en invernaderos Resumen El objetivo principal de este estudio fue validar experimentalmente un modelo mecánistico para predecir la eficacia de enfriamiento (η) de placas porosas construidas con arcilla expandida. El material de arcilla expandida fue físicamente caracterizado encontrando su masa específica, área superficial y volumen. El modelo fue validado con datos de temperatura de bulbo seco (Tdb, ° C) y humedad relativa del aire (humedad relativa,%) que fueron continuamente monitoreados en dos puntos diferentes, en contra y a favor de la dirección del aire que pasa a través de la placa porosa. La recolección de datos se llevó a cabo de forma consecutiva durante un período de 10 días entre las 11:00 y 4:00 p.m. Los valores medios de η, simulados y observados, fueron 74,8 ± 7,4% y 68,3 ± 8,3%, respectivamente. Basado en el modelo desarrollado, se observó que η fue mayor del 40% para Tdb> 30 ° C y HR constante en 45%. La simulación indicó que el aumento de la temperatura del aire puede afectar negativamente la producción en invernaderos en Estados como Minas Gerais, Brazil, si no se revisan algunos criterios de diseño en el sistema de enfriamiento por evaporación.Palabras clave: Invernadero; modelo matemático; simulación; transferencia de calor y masa.

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Impact of global warming on beef cattle production cost in Brazil

Cited by 22 publications

References 20 publications

Effect of a simulated heat wave in thermal and aerial environment broiler-rearing environment

Effect of a simulated heat wave in thermal and aerial environment broiler-rearing environment

Economic efficiency of suckler cow herds in the Czech Republic

Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates

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