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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

Vieira, Frederico Márcio C. ; Groff, Priscila Michelin ; Silva, Iran José O. ; Nazareno, Aérica C. ; Godoy, Thais F. ; Coutinho, Luiz L. ; Vieira, Afrânio Márcio C. ; Silva-Miranda, Késia O.

International journal of biometeorology, 2019-06, Vol.63 (6), p.777-785 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
Impact of exposure time to harsh environments on physiology, mortality, and thermal comfort of day-old chickens in a simulated condition of transport
Autor: Vieira, Frederico Márcio C. ; Groff, Priscila Michelin ; Silva, Iran José O. ; Nazareno, Aérica C. ; Godoy, Thais F. ; Coutinho, Luiz L. ; Vieira, Afrânio Márcio C. ; Silva-Miranda, Késia O.
Assuntos: Animal Physiology ; Animals ; Biological and Medical Physics ; Biophysics ; Body temperature ; Body weight ; Chickens ; Chicks ; Cold treatment ; Containers ; Design of experiments ; Earth and Environmental Science ; Environment ; Environmental Health ; Experimental design ; Exposure ; Gene expression ; Harsh environments ; Heat ; Heat shock proteins ; Heat treatment ; Hsp70 protein ; Hypothermia ; Juveniles ; Meteorology ; Mortality ; Original Paper ; Physiological responses ; Physiology ; Plant Physiology ; Poultry ; Respiration ; Respiratory rate ; Simulation ; Surface temperature ; Thermal comfort ; Thermal stress
É parte de: International journal of biometeorology, 2019-06, Vol.63 (6), p.777-785
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: The aim of this study was to assess the variation of physiological responses and mortality of day-old chicks subjected to different thermal conditions and exposure times during simulated transport. For this purpose, day-old chicks ( n = 900) were used and subjected to simulated conditions of transport in a climate chamber. The experimental design was a completely randomized block design, with the structure of the treatments in a 3 × 3 factorial scheme (thermal ranges and time intervals) and each level of containers considered a block. The physiological variables used in this trial were body weight, respiratory rate, cloacal temperature, average surface temperature, and gene expression of heat shock protein (HSP70). Regarding body weight, a small variation was observed between treatments ( P > 0.05). The animals subjected to the heat treatment exhibited respiratory rates above 100 movements per minute ( P < 0.05), average cloacal temperatures above 44.7 °C, surface temperatures above the comfort zone (greater than 39.6 °C; P < 0.05), and increased gene expression of HSP70 ( P < 0.001), especially after 3 initial hours of exposure. In addition, the heat treatment lead to increased mortality of the animals (over 6%). Also in the cold treatment, despite the absence of mortality, the animals showed hypothermia from 3 h of exposure, based on the results of the average surface (28 °C) and cloacal temperatures (39.6 °C; P < 0.05). In this way, the results imply that the effects of thermal stress caused by heat as well as by cold in a simulated transport condition are increased when traveling for more than 3 h, indicating a trend of rising mortality after long-term transportation of day-old chickens.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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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

Vieira, Frederico Márcio C. ; Groff, Priscila Michelin ; Silva, Iran José O. ; Nazareno, Aérica C. ; Godoy, Thais F. ; Coutinho, Luiz L. ; Vieira, Afrânio Márcio C. ; Silva-Miranda, Késia O.

Berlin/Heidelberg: Springer Berlin Heidelberg

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