Thermal stress related with mortality rates on broilers' preslaughter operations: a lairage time effect study

Vieira, Frederico Márcio Corrêa; Silva, Iran José Oliveira da; Filho, José Antônio Delfino Barbosa; Vieira, Afrânio Márcio Corrêa; Sarnighausen, Valéria Cristina Rodrigues; Garcia, Danilo de Brito

doi:10.1590/s0103-84782011005000111

Cited by 10 publications

(9 citation statements)

References 19 publications

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“…The results of the present (1) (2) study are in accordance with Vieira et al (2011), who reported that the daily periods with temperature a >25 °C are the harsh periods for transportation, with respect to thermal comfort ranges for broiler chickens. During morning and night, the temperature was below the thermal comfort range of birds, either considering the thermal gradient between the crates and external environment.…”

Section: Resultssupporting

confidence: 91%

Modeling preslaughter mortality of broiler chickens using double generalized linear models

Vieira

Silva

Vieira

2014

Agraria

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The aim of this study was to estimate parameters and design models for mortality prediction of broiler chickens in different preslaughter conditions, using the double generalized linear models. Preslaughter data from 13,937 broiler flocks were recorded daily during 2006, in a commercial slaughterhouse in Brazil. Several factors which influenced mortality rate were analysed, such as daily mean drybulb temperature and relative humidity, lairage time, daily periods, density of broilers per crate and season of the year. The data were analysed using a Double Generalized Linear Model, an extension of Generalized Linear Models (GLM), which provides a framework for modeling the dispersion in generalized linear models as well as the mean. As results, the double generalized linear models showed high accuracy for broiler mortality estimation, through interactions between the main factors which have influence on preslaughter operations.Key words: poultry production, preslaughter operations, stochastic models Modelización de la mortalidad previo al sacrificio de pollos con modelos lineales generalizados doble RESUMEN El objetivo de este estudio fue estimar parámetros y diseñar modelos para predecir la mortalidad de pollos de engorde en distintas condiciones de pre abate, utilizándose de un modelo linear generalizado doble. Datos del pre abate de 13.937 pollos fueron colectados diariamente durante el año de 2006 en un matadero comercial en Brasil. Distintos factores que tienen influencia sobre la tasa de mortalidad fueron analizados, como la media de temperatura de bulbo seco y humedad relativa del aire, tiempo de estabulación, periodos diarios, densidad de los pollos por caja y estaciones del año. Los datos fueron analizados utilizándose del Modelo Linear Generalizado Doble, una extensión del Modelo Linear Generalizado (MLG), que proporciona un marco para el modelado de la dispersión en los modelos lineares generalizados y también la media. Como resultado, el modelaje linear generalizado doble demostró una alta precisión para estimar la tasa de mortalidad de pollos de engorde, a través de las interacciones entre los principales factores que influyen en las operaciones antes del abate de los animales.Palabras clave: modelos estocásticos, operaciones previas al sacrificio, producción avícola

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Section: Resultssupporting

confidence: 91%

Modeling preslaughter mortality of broiler chickens using double generalized linear models

Vieira

Silva

Vieira

2014

Agraria

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“…Of the DOA evaluated by necropsy in the UK, 25% were attributed to preexisting flock health status, 35% to catching, loading, and transport injuries, and 40% of the DOA were linked to heat or cold stress (Ritz et al, 2005). High temperature and relative humidity in the tropics are major concerns regarding broiler survival prior to slaughtering (Vieira et al, 2011b). A significant relationship between the time of year and mortality rate was reported by Tabbaa and Alshawabkeh (2000) in Jordan.…”

Section: Discussionmentioning

confidence: 99%

Negative Trends in Transport-related Mortality Rates in Broiler Chickens

Večerek

Voslářová

Conte

et al. 2016

Asian Australas. J. Anim. Sci

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The high incidence of deaths during transport for slaughter is associated with poor welfare and represents a considerable loss to the poultry industry. In the period from 2009 to 2014, all shipments of broiler chickens to poultry processing plants were monitored in the Czech Republic and the numbers of chickens transported and those dying as a result of their transport were recorded and analysed. Overall transport-related mortality of broiler chickens transported for slaughter in the Czech Republic was 0.37%. It ranged from 0.31% to 0.72%, the increase approximately corresponding to the increasing transport distance. Statistically highly significant (p<0.001) differences were found when comparing transport-related mortality rates in individual seasons of the year. The greatest mortality (0.55%) was associated with transports carried out in winter months whereas the lowest death losses (0.30%) were found in chickens transported for slaughter in summer months. Our study revealed greater transport-related mortality rates in broiler chickens transported for slaughter in the Czech Republic than expected when considering earlier studies. The most pronounced increases were found in transports for shorter distances and in winter months. However, an increase was found at all transport distances monitored except for distances exceeding 300 km and all seasons except for summer. Furthermore, a general increasing tendency in chicken losses during the monitored period was found. The particularly alarming finding is that the mortality of broiler chickens being transported to processing plants has been showing a long-term increasing tendency over the last two decades. Further research should focus on the identification of specific factors leading to such high and growing mortality rates and developing practical guidelines to improve the welfare of the birds in transit accordingly.

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“…Several studies have considered the effect of transportation duration and distance on animal welfare and resultant meat quality of broiler chickens. However, the reports are contradictory, where the majority of studies have associated long-term transportation to higher mortalities (Nijdam et al, 2004;Vecerek, Grbalova, Voslarova, Janackova, & Malena, 2006;Vieira, Silva, Barbosa Filho, Vieira, & Broom, 2011;Vieira, Silva, Barbosa Filho, Vieira, Rodrigues-Sarnighausen, et al, 2011;Warriss, Bevis, & Brown, 1990;Whiting et al, 2007), but some have indicated that short-term transportation could be more stressful to the birds (Vosmerova et al, 2010). Nijdam et al (2004) reported an increase of 6% in DOA for each additional 15 min in transportation time and an additional increase of 3% for each extra 15 min in lairage time based on transport of 1907 Dutch and German broiler flocks, and concluded that the concurrent effect of temperature and journey duration is an important determinant of DOA.…”

Section: Transport Duration and Distancementioning

confidence: 99%

“…The microclimate within the trailer is the most important factor affecting broiler welfare during transportation, as heat and cold stresses are two major contributors to both death and overall transportation stress in broilers (Hunter, Mitchell, & Carlisle, 1999;Hunter, Mitchell, & Matheu, 1997;Mitchell & Kettlewell, 2009;Mitchell, Kettlewell, Hunter, & Carlisle, 2001;Mitchell, Kettlewell, & Maxwell, 1994;Vieira, Silva, Barbosa Filho, Vieira, & Broom, 2011;Vieira, Silva, Barbosa Filho, Vieira, Rodrigues-Sarnighausen, et al, 2011;Weeks & Nicol, 2000). Post-mortem assessment of DOA birds has revealed that 40% of birds die from thermal stress due to uneven ventilation of the truck and failures in thermoregulation of birds (Kettlewell, Hoxey, & Mitchell, 2000;Mitchell & Kettlewell, 1998).…”

Section: Effect On Doamentioning

confidence: 99%

Road transport of cattle, swine and poultry in North America and its impact on animal welfare, carcass and meat quality: A review

Schwartzkopf-Genswein¹,

Faucitano²,

Dadgar³

et al. 2012

Meat Science

307

194

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Thermal stress related with mortality rates on broilers' preslaughter operations: a lairage time effect study

Abstract: Concerning the reduction of preslaughter death losses, high temperature and relative humidity in the tropics

Cited by 10 publications

References 19 publications

Modeling preslaughter mortality of broiler chickens using double generalized linear models

Modeling preslaughter mortality of broiler chickens using double generalized linear models

Negative Trends in Transport-related Mortality Rates in Broiler Chickens

Road transport of cattle, swine and poultry in North America and its impact on animal welfare, carcass and meat quality: A review

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