Impact of exposure time to harsh environments on physiology, mortality, and thermal comfort of day-old chickens in a simulated condition of transport

Vieira, Frederico Márcio Corrêa; Groff, Priscila Michelin; Silva, Iran José O.; Nazareno, Aérica Cirqueira; Godoy, Thaís Fernanda; Coutinho, Luiz Lehmann; Vieira, Afrânio Márcio Corrêa; Miranda, Késia Oliveira da Silva

doi:10.1007/s00484-019-01691-4

Cited by 15 publications

(22 citation statements)

References 34 publications

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Section: Resultsmentioning

confidence: 95%

“…For the night shift, it was verified that the air relative humidity was above the recommended ranges (50%-60%) for the three trucks according to Quinn & Baker (1997), Mujahid & Furuse (2009), Nazareno et al (2015a) and Vieira et al (2019). Because this variable acts directly on the heat exchanges (sensitive and latent) of chicks (Vieira et al, 2019), these birds tend to have difficulty in thermal exchange. Evaporative (latent) heat loss increases with temperature; however, it decreases with increasing air relative humidity, and its participation in the thermoregulation of the bird depends on the air temperature and the age of the bird (Cassuce et al, 2013;Vieira et al, 2019).…”

Section: Resultsmentioning

confidence: 95%

“…Based on the thermal comfort range of day-old chicks (32-35 °C) established by Mujahid & Furuse (2009) and Vieira et al (2019) and the mean thermal gradient of 4 °C (temperature difference of the container environment and interior of the chick boxes) in the air-conditioned trucks used to transport these birds, all the vehicles in day shift were within the range of comfort, because the average internal temperatures of the boxes were estimated 34.21, 32.63 and 32.51 °C, respectively, for the CL, CA and JA trucks. However, trucks during night shifts were below the comfort temperature range at 30.00, 28.21 and 28 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Because this variable acts directly on the heat exchanges (sensitive and latent) of chicks (Vieira et al, 2019), these birds tend to have difficulty in thermal exchange. Evaporative (latent) heat loss increases with temperature; however, it decreases with increasing air relative humidity, and its participation in the thermoregulation of the bird depends on the air temperature and the age of the bird (Cassuce et al, 2013;Vieira et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

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Real-time web-based microclimate monitoring of broiler chicken trucks on different shifts

Nazareno

Silva

Nunes³

et al. 2020

Rev. bras. eng. agríc. ambient.

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This research aimed to monitor and evaluate air-conditioned trucks transporting day-old chicks, in various shifts of travel, through general packet radio service (GPRS) technology to provide real-time thermal control for poultry industry managers. The Control-Broilers equipment used were GS-105 and the Monitorar Platform. GS-105 is composed of sensors, a microprocessor, GPRS, and batteries. The Monitorar Platform provided nine applications that acted in coordination with web technology RESTful services. Twenty-eight chick transports were evaluated and monitored using the Control-Broilers. Truck routes were supervised by two researchers to ensure real-time data transmission through laptops and smartphones. Three air-conditioned trucks were used during two of days shifts. The vehicles had the same dimensions, but the routes, travel times, and load densities varied. Measurements of the air temperature, relative humidity, and specific enthalpy inside the trucks were recorded every minute. The experimental design was entirely randomized in a 3 × 2 factorial scheme, which represented the three trucks (CL, CA and JA) in two transport shifts (day and night), containing four repetitions (travel).The air-conditioned trucks transporting day-old chicks presented a 92.85% efficiency for real-time data transmission using GPRS technology. The trucks during the travel shifts did not provide thermal homogeneity in chick loads. The night shift presented worse thermal conditions.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Real-time web-based microclimate monitoring of broiler chicken trucks on different shifts

Nazareno

Silva

Nunes³

et al. 2020

Rev. bras. eng. agríc. ambient.

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“…The detrimental effects of heat stress on poultry range from reduced growth and egg production to decreased egg quality and safety [5,6]. Moreover, high ambient temperatures have marked impacts on the behaviour, feed and water intake, heat production, and physiological responses (body temperature, respiratory rate and heart rate) of poultry [7,8], which might elicit specific vocalisation such as alarm, squawk, and gakel calls [9].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Laying Hens’ Thermal Comfort Using Sound Technology

Carpentier

Teng

et al. 2020

Sensors

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Heat stress is one of the most important environmental stressors facing poultry production and welfare worldwide. The detrimental effects of heat stress on poultry range from reduced growth and egg production to impaired health. Animal vocalisations are associated with different animal responses and can be used as useful indicators of the state of animal welfare. It is already known that specific chicken vocalisations such as alarm, squawk, and gakel calls are correlated with stressful events, and therefore, could be used as stress indicators in poultry monitoring systems. In this study, we focused on developing a hen vocalisation detection method based on machine learning to assess their thermal comfort condition. For extraction of the vocalisations, nine source-filter theory related temporal and spectral features were chosen, and a support vector machine (SVM) based classifier was developed. As a result, the classification performance of the optimal SVM model was 95.1 ± 4.3% (the sensitivity parameter) and 97.6 ± 1.9% (the precision parameter). Based on the developed algorithm, the study illustrated that a significant correlation existed between specific vocalisations (alarm and squawk call) and thermal comfort indices (temperature-humidity index, THI) (alarm-THI, R = −0.414, P = 0.01; squawk-THI, R = 0.594, P = 0.01). This work represents the first step towards the further development of technology to monitor flock vocalisations with the intent of providing producers an additional tool to help them actively manage the welfare of their flock.

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The specific enthalpy of air as an indicator of heat stress in livestock animals

Júnior

Silva

2020

Int J Biometeorol

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Impact of exposure time to harsh environments on physiology, mortality, and thermal comfort of day-old chickens in a simulated condition of transport

Cited by 15 publications

References 34 publications

Real-time web-based microclimate monitoring of broiler chicken trucks on different shifts

Real-time web-based microclimate monitoring of broiler chicken trucks on different shifts

Assessment of Laying Hens’ Thermal Comfort Using Sound Technology

The specific enthalpy of air as an indicator of heat stress in livestock animals

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