Sensible heat loss: the broiler's paradox

Yahav, S.; Shinder, D.; Tanny, Josef; Cohen, Shabtai

doi:10.1079/wps200453

Cited by 112 publications

(95 citation statements)

References 54 publications

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“…Several studies show similar results (Yahav et al, 2005, Dahlke et al, 2005Welker et al, 2008). Mello et al (2011) found that heat stress during rearing may increase the incidence of footpad dermatitis, increasing carcass downgrade rates due to footpad lesions.…”

Section: Incidence Of Pododermatitis In Broiler Reared Under Two Typesupporting

confidence: 59%

Incidence of Pododermatitis in Broiler Reared under Two Types of Environment

Jacob

Baracho

Nääs

et al. 2016

Rev. Bras. Cienc. Avic.

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Housing environment is essential to achieve good broiler performance and to prevent diseases, including footpad dermatitis (FPD). The objective of this study was to determine the incidence of footpad dermatitis in broilers chickens according to housing type. The study was carried out with broilers reared for 5, 12, 19, 29 and 40 days. Four houses were used in this observational study. House 1 (A1) had positive pressure and reused litter; house 2 (A2) had positive pressure and new litter (sawdust); house 3 (A3) had positive pressure and new litter (rice husks); and house 4 (A4) had negative pressure and reused litter. During the entire experiment, air environmental and litter surface temperatures, and litter compaction were recorded. Pododermatitis was assessed by visual scoring of the footpads. Footpads were scored as function of the severity of the lesion. The comparison of means by the test of Bonferroni at 95% confidence interval showed higher incidence of footpad dermatitis in A3, probably due to the particle size of litter substrate. The lowest footpad dermatitis incidence was found in A1, with reused sawdust litter.

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Section: Incidence Of Pododermatitis In Broiler Reared Under Two Typesupporting

confidence: 59%

Incidence of Pododermatitis in Broiler Reared under Two Types of Environment

Jacob

Baracho

Nääs

et al. 2016

Rev. Bras. Cienc. Avic.

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“…In this experiment broilers were exposed to heat stress in the afternoon, and the weather data in the previous week was very similar, indicating that birds were exposed to the same weather profile for nearly seven days. The process of acclimatization (IUPS Thermal Commission, 2001) requires from four to seven days to be completed in domestic fowls (Yahav et al, 2005). Therefore, the alterations related to the threshold response to physiological changes which are involved in heat dissipation are not likely to have yet taken place in the studied birds when data were collected.…”

Section: Resultsmentioning

confidence: 99%

“…Zhou and Yamamoto (1997) measured the response of surface temperature in broilers and found the largest values in featherless skin temperature when increasing air temperature to 28°C, indicating that those areas are probably considered to be specialized for temperature regulation, since they can adjust heat exchange (Yahav et al, 2004). Although the input to heat exchange of feathered areas is small but as it corresponds to a large area it has to be included in all sensible heat loss calculations (Yahav et al, 2005).…”

Section: Resultsmentioning

confidence: 99%

Broiler surface temperature distribution of 42 day old chickens

Nääs

Romanini

Neves

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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Broiler chickens in Brazil are generally reared from 1 to 42 days when they are exposed to procedures such as fasting, harvesting, crating and transport to slaughter. Maintaining homeostasis is of great importance for broiler survival under harsh environment especially prior to slaughter. Heat loss varies in the distinct parts of the body during the growth period, and it is related to the air temperature of the environment and to the amount of feather covering. This research aimed to study the surface temperature distribution using infrared thermographic image processing to characterize 42 day old broiler chicken surface temperature prior to slaughter. Broilers were reared for 42 days and prior to harvest and transport to slaughter the infrared surface temperature was recorded along the day. Data from the thermograms taken in feather and featherless regions were compared during the 42 nd day of growth. High correlation between featherless regions and air temperature was found showing that these areas respond fast to changes in the rearing environment. Two functions were developed for predicting both surface temperature for featherless and feather covered areas of the broiler body parts. Key words: thermal comfort, heat loss, thermoregulation, infrared thermography Distribuição da temperatura superficial de frangos de corte com 42 dias de idade RESUMO: No Brasil frangos de corte são normalmente alojados de 1 até 42 dias, quando são expostos a procedimentos como: jejum, apanha, colocação em caixas e transporte até o abate. Manter a homeostase do corpo é de grande importância para a sobrevivência de frangos de corte sob ambiente quente, especialmente na 7ª semana de crescimento. A perda de calor varia nas partes do corpo e está relacionada à temperatura do ar e à cobertura de penas. Avaliou-se a distribuição da temperatura superficial usando o processamento de imagens de câmera termográfica infravermelho, para caracterizar a temperatura superficial de frangos de corte de 42 dias de idade, no período anterior à apanha para o abate. Os frangos foram alojados de 1 a 42 dias e, antes de serem apanhados e transportados para o abate, foram registradas temperaturas superficiais infravermelho durante o dia.. Os resultados dos termogramas das regiões com penas e sem penas foram comparados, durante o 42º dia. Alta correlação entre regiões sem penas e a temperatura ambiente foi encontrada, mostrando que estas áreas respondem rapidamente a alterações no ambiente do alojamento. Duas funções foram desenvolvidas para predizer a temperatura superficial das regiões com e sem penas, do corpo de frangos com 42 dias, sendo conhecida a temperatura do ar do ambiente. Palavras-chave: conforto térmico, perda de calor, termorregulação, termografia infravermelha

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“…Chicken health, welfare and growth performance is dependent on human management, environmental management, genetics, nutritional and disease factors (Yahav et al, 2005;Buijs et al, 2009;Kenny et al, 2012). Progress has been made in the last 10 years to develop indices and potential on-farm measures of animal welfare, for example, the AWIN (2015) and Welfare Quality (2009) protocols.…”

Section: Introductionmentioning

confidence: 99%

Vocalisation sound pattern identification in young broiler chickens

Fontana

Tullo

Scrase

et al. 2016

animal

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In this study, we describe the monitoring of young broiler chicken vocalisation, with sound recorded and assessed at regular intervals throughout the life of the birds from day 1 to day 38, with a focus on the first week of life. We assess whether there are recognisable, and even predictable, vocalisation patterns based on frequency and sound spectrum analysis, which can be observed in birds at different ages and stages of growth within the relatively short life of the birds in commercial broiler production cycles. The experimental trials were carried out in a farm where the broiler where reared indoor, and audio recording procedures carried out over 38 days. The recordings were made using two microphones connected to a digital recorder, and the sonic data was collected in situations without disturbance of the animals beyond that created by the routine activities of the farmer. Digital files of 1 h duration were cut into short files of 10 min duration, and these sound recordings were analysed and labelled using audio analysis software. Analysis of these short sound files showed that the key vocalisation frequency and patterns changed in relation to increasing age and the weight of the broilers. Statistical analysis showed a significant correlation ( P < 0.001) between the frequency of vocalisation and the age of the birds. Based on the identification of specific frequencies of the sounds emitted, in relation to age and weight, it is proposed that there is potential for audio monitoring and comparison with 'anticipated' sound patterns to be used to evaluate the status of farmed broiler chicken.

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Sensible heat loss: the broiler's paradox

Cited by 112 publications

References 54 publications

Incidence of Pododermatitis in Broiler Reared under Two Types of Environment

Incidence of Pododermatitis in Broiler Reared under Two Types of Environment

Broiler surface temperature distribution of 42 day old chickens

Vocalisation sound pattern identification in young broiler chickens

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