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

Ponciano, Patrícia Ferreira; Yanagi, Tadayuki; Lima, Renato Ribeiro de; Schiassi, Leonardo; Teixeira, Vítor Hugo

doi:10.1590/s0100-69162012000100002

Cited by 8 publications

(14 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 3 shows the variation in heat exchanges by sensible and latent means as a function of the atmospheric temperature. The latent exchanges were negative in the first week of the production cycle, which is explained by the fact that the prediction model of the cloacal temperature (PONCIANO et al, 2012) considers in its estimates, birds 14 days old, that is, the author believed that thermoneutrality would reside in a body nucleus temperature of 41ºC, which would indicate minimum exchanges of 10 W m -2 . At high temperatures, the latent exchange intensified, demonstrating the means which birds have of maintaining homeothermy by evaporation and respiration, while the sensible exchanges diminish with increasing temperature.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Energy balance in the poultry-shed system and its influence on broiler performance

2015

View full text Add to dashboard Cite

ABSTRACT:The objective of this study was to determine the energy balance of the poultry-shed system and its effect on broiler performance during the production cycle. The experimental design was completely random with sub-divided blocks. The blocks were composed of five different types of sheds and the sub-blocks of the evaluation times (00:00 h to 23:00 h), allowing an analysis of variance and a comparison between means with the Tukey test. There were no significant differences between the mean values of the exchanges of sensible, latent and total heat between the poultry sheds but the differences for the evaluation times were significant (P<0.05). There was no significant difference between sheds 1 and 4 for broiler productive performance regarding weight gain, feed consumption and feed conversion. Bird performance was significant (P<0.05) for the remaining poultry sheds. The productive indexes remained below the ranges considered ideal for broilers and values in the final weeks were characterized by the poor installation efficiency in controlling temperature variations and, consequently, the energy balance in the system, which adversely affected bird productive performance. KEYWORDS: broiler industry, thermal comfort, thermography BALANÇO DE ENERGIA NO SISTEMA AVE-GALPÃO E SUA INFLUÊNCIA NO DESEMPENHO DE FRANGOS DE CORTERESUMO: Objetivou-se com este estudo a determinação do balanço de energia no sistema ave--galpão e seu efeito no desempenho de frangos de corte, durante o ciclo de produção. O delineamento experimental adotado foi o inteiramente ao acaso, no esquema de parcelas subdivididas, tendo-se nas parcelas cinco galpões, com tipologias distintas e, nas subparcelas, os horários de avaliação (00:00 h às 23:00 h), o que permitiu a análise de variância e a comparação entre médias, pelo teste de Tukey. Os valores médios das trocas de calor sensível, latente e totais não apresentaram diferença significativa entre os galpões estudados, mas quanto aos horários o efeito foi significativo (P<0,05). O desempenho produtivo das aves não apresentou diferença significativa nos galpões 1 e 4 para as variáveis ganho de peso, mortalidade, consumo de ração e conversão alimentar. Para os demais galpões, evidenciou-se efeito significativo (P<0,05) na performance dos animais. Nota-se que os índices produtivos se mantiveram abaixo das faixas tidas como ideais para a avicultura de corte, e os valores das últimas semanas são caracterizados pela baixa eficiência das instalações em controlar a variação da temperatura, e com isso, o balanço de energia no sistema, o que afetou negativamente o desempenho produtivo das aves.PALAVRAS-CHAVE: avicultura de corte, conforto térmico, termografia.

show abstract

Section: Resultsmentioning

confidence: 99%

“…For this rectal temperature, a regression model proposed by PONCIANO et al (2012), was used using [eq. (5) The zootechnical performance of the birds was calculated from the body weight, daily weight gain, feed conversion and the mortality rate.…”

Section: Methodsmentioning

confidence: 99%

Energy balance in the poultry-shed system and its influence on broiler performance

2015

View full text Add to dashboard Cite

show abstract

“…(Ribeiro Junior & Diggle, 2001). Figure 3 shows the values of the variables inside the broiler aviary during the experimental period and indicates the threshold of the variables t db ( o C) and RH (%) recommended by Medeiros et al (2005) and H (kJ ) recommended by Ponciano et al (2012) through dashed lines.…”

Section: Methodsmentioning

confidence: 99%

Spatial and temporal distribution of enthalpy in aviary heated by industrial furnace

Ferraz

Yanagi

et al. 2018

Rev. Ceres

Self Cite

View full text Add to dashboard Cite

The enthalpy is a thermodynamic property that can be used to evaluate thermal environment for chickens, considering the meteorological variables that most influence the animal’s thermal comfort, the dry-bulb temperature and the relative humidity. The aim was to analyze and compare the spatial variability of enthalpy in a broiler aviary during three periods of the day (morning, afternoon and night) for 14 living days, using geostatistical techniques. The experiment was performed in a commercial broiler aviary located in the western mesoregion of Minas Gerais, Brazil, where 28,000 male Cobb chicks were housed. The heating system consisted of an industrial indirect-fired biomass furnace. The heated air was inflated by an AC motor, 2206 W of power, 1725 RPM. Geostatistical techniques were used through semivariogram analysis and isochore maps were generated through data interpolation by kriging. The semivariogram was fitted by the restricted maximum likelihood method. The used mathematical model was the spherical one. After fitting the semivariograms, the data were interpolated by ordinary kriging. The semivariograms along with the isochore maps allowed identifying the non-uniformity of spatial distribution of the enthalpy throughout the broiler aviary for three periods during 14 days. It was observed that in the first two days of life, during the three evaluated periods the poultry kept most of the time and in most of the poultry shed under conditions of enthalpy below the recommended level in the literature. In the12th and 13th days during the three analyzed periods were the most critical because they showed values below the comfort throughout the day, over the entire broiler aviary. Possible failures in the heating system were also observed, especially at night, which can be a discomfort source for poultry and hence generate productive and economic losses.

show abstract

“…Ponciano et al (2012) claim that, in the first week of life, the ideal values of H range from 73 to approximately 102 kJ kg -1 dryair. Figure 3 shows the frequency of occurrence of H values along the broiler house, obtained after interpolation by kriging.…”

Section: Daymentioning

confidence: 99%

“…As to the second week of life and according to Ponciano et al (2012), the chicks must be maintained in environments with H values between 60 and 101 kJ kg -1 dryair. Based on Figures 4 and 5, H values varied from 55 to 90 kJ kg -1 dryair.…”

Section: Daymentioning

confidence: 99%

Spatial variability of enthalpy in broiler house during the heating phase

Ferraz

Yanagi

Ferraz

et al. 2016

Rev. bras. eng. agríc. ambient.

Self Cite

View full text Add to dashboard Cite

A B S T R A C TThe thermal environment inside a broiler house has a great influence on animal welfare and productivity during the production phase. Enthalpy is a thermodynamic property that has been proposed to evaluate the internal broiler house environment, for being an indicator of the amount of energy contained in a mixture of water vapor and dry air. Therefore, this study aimed to characterize the spatial variability of enthalpy in a broiler house during the heating phase using geostatistics. The experiment was conducted in the spring season, in a commercial broiler house with heating system consisting of two furnaces that heat the air indirectly, in the first 14 days of the birds' life. It was possible to characterize enthalpy variability using geostatistical techniques, which allowed observing the spatial dependence through kriging maps. The analyses of the maps allowed observing problems in the heating system in regions inside the broiler house, which may cause a thermal discomfort to the animals besides productive and economic losses.Variabilidade espacial da entalpia em galpões avícolas na fase de aquecimento R E S U M O Dentro de um galpão avícola o ambiente térmico exerce grande influência sobre o bem-estar e a produtividade dos animais, ao longo do ciclo de produção. A entalpia é uma propriedade termodinâmica que tem sido proposta para avaliação do ambiente interno de galpões de criação de frangos de corte por ser um indicador da quantidade de energia contida em uma mistura de vapor d'água e ar seco razão por que se objetivou, com o presente trabalho, caracterizar a variabilidade espacial da entalpia em um galpão de frangos durante a fase de aquecimento de pintinhos utilizando a geoestatística. O experimento foi conduzido na primavera, em um galpão comercial com sistema de aquecimento constituído de duas fornalhas de aquecimento indireto do ar, durante os primeiros 14 dias de vida das aves. Utilizando as técnicas da geoestatística foi possível caracterizar a magnitude da variabilidade espacial da entalpia permitindo a observação da dependência espacial por meio de mapas de krigagem. A análise dos mapas permitiu observar a existência de falhas no sistema de aquecimento em regiões do galpão, que podem ser possíveis causadoras de desconforto térmico para os animais, além de perdas produtivas e econômicas.

show abstract

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

Cited by 8 publications

References 16 publications

Energy balance in the poultry-shed system and its influence on broiler performance

Energy balance in the poultry-shed system and its influence on broiler performance

Spatial and temporal distribution of enthalpy in aviary heated by industrial furnace

Spatial variability of enthalpy in broiler house during the heating phase

Contact Info

Product

Resources

About