Avaliação energética e de desempenho de frangos com aquecimento automático a gás e a lenha

Funck, Sandro R.; Fonseca, Ricardo Alves da

doi:10.1590/s1415-43662008000100014

Cited by 10 publications

(9 citation statements)

References 3 publications

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“…È methane : methane density (kg.m −3 ) The firewood energy content (Equation 3) was obtained according to the methodology described by Funck and Fonseca (2008) using firewood's lower calorific value and the total amount of wood used to produce 1 broiler cycle; the data used are presented in Table 2.…”

Section: Energy Demanded From Firewood and Biogasmentioning

confidence: 99%

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Poultry Litter Solid State Anaerobic Digestion: Effect of Digestate Recirculation Intervals and Substrate/Inoculum Ratios on Process Efficiency

Marchioro

Steinmetz

Amaral

et al. 2018

Front. Sustain. Food Syst.

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This study evaluated the effect of the substrate:inoculum ratio and digestate recirculation conditions on the biogas and methane yield, free ammonia concentration and solid phase agronomic quality (after treatment) of poultry litter solid state anaerobic digestion (SSAD). Experimental tests were conducted using a central composite design (2²), with four trials at the factorial points and three at the central points, using poultry litter as substrate that was collected after 12 cycles of broiler production [TS 76% (w.w −1 )]. Three laboratory-scale reactors containing 3 kg of poultry litter each were operated at mesophilic conditions (37 • C) and seven experimental runs were performed at retention time of 30 days each. There were three substrate:inoculum ratios (1:1; 1:1.66, and 1:3) and three daily recirculation intervals (2, 3, and 4 times per day), and each recirculation event lasted 15 min. The highest biogas and methane yields were183 L Nbiogas .kg VSadd , respectively, and they were obtained at the substrate:inoculum ratio of 1:3 with a digestate recirculation frequency of four times a day. Digestate recirculation was the variable that influenced the concentration of free ammonia; the most frequently recirculated tests had lower concentrations (below 60 mgNH 3 .L −1 ). After the SSAD process, we identified a transfer of nutrients (N, P, K) from the solid phase to the liquid phase. The nutrient concentrations in the solid phase (N out = 11 g.kg −1 , K out = 5 g.kg −1 , and P out = 7 g.kg −1 ) indicated that the digested poultry litter still has potential for use in fertilization. In this study, it was estimated that 90 m 3 biogas .tons −1 poultrylitter was generated using SSAD. Whereas 100 tons of poultry litter are produced after 12 production cycles, the biogas generation capacity reaches 9,000 m 3 /year. In this scenario, farmers can use biogas from poultry litter SSAD as an additional source of energy.

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Section: Energy Demanded From Firewood and Biogasmentioning

confidence: 99%

“…The biogas volume required to supply the energy demanded using firewood was calculated according Equation 4 (Funck and Fonseca, 2008).…”

Section: Energy Demanded From Firewood and Biogasmentioning

confidence: 99%

Poultry Litter Solid State Anaerobic Digestion: Effect of Digestate Recirculation Intervals and Substrate/Inoculum Ratios on Process Efficiency

Marchioro

Steinmetz

Amaral

et al. 2018

Front. Sustain. Food Syst.

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“…In southern Brazil, wood-burning furnaces or gas brooders are used for heating broiler houses (Funck & Fonseca, 2008;Carvalho, 2010;Cordeiro et al, 2010). EMBRAPA (Brazilian Agricultural Research Agency) also mentions that diesel and electricity are used as heating sources, and the application of biogas and solar energy has been experimentally evaluated (Silva et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Multi-Criteria Analysis to Prioritize Energy Sources for Ambience in Poultry Production

Collatto

Mansilha

Chiwiacowsky

et al. 2017

Rev. Bras. Cienc. Avic.

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This paper intends to outline a model of multi-criteria analysis to pinpoint the most suitable energy source for heating aviaries in poultry broiler production from the point of view of the farmer and under environmental logic. Therefore, the identification of criteria was enabled through an exploratory study in three poultry broiler production units located in the mountain region of Rio Grande do Sul. In order to identify the energy source, the Analytic Hierarchy Process was applied. The criteria determined and validated in the research contemplated the cost of energy source, leadtime, investment in equipment, energy efficiency, quality of life and environmental impacts. The result of applying the method revealed firewood as the most appropriate energy for heating. The decision support model developed could be replicated in order to strengthen the criteria and energy alternatives presented, besides identifying new criteria and alternatives that were not considered in this study.

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“…The thermoregulatory device of birds is poorly developed, making them sensitive to cold as young and heat as adults (FUNCK & FONSECA, 2008). If the temperature is below the thermal requirements of the birds, great part of the energy consumed in the diet, which could be used for production, is diverted to maintenance of the thermoregulatory system in the first weeks of life (CORDEIRO et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…To maintain body temperature relatively constant for the vital organs, the body heat must be stored or released in response to changes in the environment (FUNCK & FONSECA, 2008). The birds maintain their body temperature through physiological and behavioral mechanisms .…”

Section: Introductionmentioning

confidence: 99%

Adjust of regression models to estimate the rectal temperature of broilers for the first 14 days of life

et al. 2012

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ABSTRACT:The broiler rectal temperature (t rectal ) is one of the most important physiological responses to classify the animal thermal comfort. Therefore, the aim of this study was to adjust regression models in order to predict the rectal temperature (t rectal ) of broiler chickens under different thermal conditions based on age (A) and a meteorological variable (air temperature -t air ) or a thermal comfort index (temperature and humidity index -THI or black globe humidity index -BGHI) or a physical quantity enthalpy (H). In addition, through the inversion of these models and the expected t rectal intervals for each age, the comfort limits of t air , THI, BGHI and H for the chicks in the heating phase were determined, aiding in the validation of the equations and the preliminary limits for H. The experimental data used to adjust the mathematical models were collected in two commercial poultry farms, with Cobb chicks, from 1 to 14 days of age. It was possible to predict the t rectal of conditions from the expected t rectal and determine the lower and superior comfort thresholds of broilers satisfactorily by applying the four models adjusted; as well as to invert the models for prediction of the environmental H for the chicks first 14 days of life.KEYWORDS: thermal environment, poultry, thermal comfort, mathematical modeling, physiological responses. MODELOS DE REGRESSÃO PARA A ESTIMATIVA DA TEMPERATURA RETAL DE FRANGOS DE CORTE DURANTE OS PRIMEIROS 14 DIAS DE VIDA RESUMO:A temperatura retal (t retal ) de frangos de corte constitui uma das principais respostas fisiológicas para a classificação da condição de conforto térmico animal. Sendo assim, objetivou-se com este trabalho o ajuste de modelos de regressão para predizer a t retal de frangos de corte em diferentes situações térmicas ambientais, em função da idade (I) e de uma variável meteorológica (temperatura do ar -t ar ) ou de um índice de conforto térmico (índice de temperatura e umidade -ITU, ou índice da temperatura do globo e umidade -ITGU) ou da grandeza física entalpia (H). Em adição, por meio da inversão desses modelos e dos intervalos de conforto esperados com base na t retal e idade, determinaram-se os limites de conforto de t ar , ITU, ITGU e H para os pintinhos na fase de aquecimento, que auxiliaram na validação das equações ajustadas e na definição de limites preliminares para H. Os dados experimentais utilizados para o ajuste dos modelos de regressão foram registrados em dois galpões comerciais, com aves da linhagem Cobb, de 1 a 14 dias de idade. Foi possível predizer, satisfatoriamente, a t retal de frangos de corte pelos quatro modelos gerados, bem como inverter os modelos para a predição das condições ambientais a partir da t retal esperada e determinar, desta forma, os limites inferior e superior de conforto para a H, para os primeiros 14 dias de vida do pintinho.

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Avaliação energética e de desempenho de frangos com aquecimento automático a gás e a lenha

Cited by 10 publications

References 3 publications

Poultry Litter Solid State Anaerobic Digestion: Effect of Digestate Recirculation Intervals and Substrate/Inoculum Ratios on Process Efficiency

Poultry Litter Solid State Anaerobic Digestion: Effect of Digestate Recirculation Intervals and Substrate/Inoculum Ratios on Process Efficiency

Multi-Criteria Analysis to Prioritize Energy Sources for Ambience in Poultry Production

Adjust of regression models to estimate the rectal temperature of broilers for the first 14 days of life

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