Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/55120
Title: Manipulação térmica durante a incubação de ovos como medida para amenizar o estresse por calor em frangos de corte
Other Titles: Thermal manipulation during egg incubation as a measure to relieve heat stress in broilers
Authors: Zangeronimo, Márcio Gilberto
Fassani, Édison José
Alvarenga, Renata Ribeiro
Fassani, Édison José
Alvarenga, Renata Ribeiro
Geraldo, Adriano
Araújo, Itallo Conrado Sousa de
Keywords: Avicultura
Frangos de corte - Estresse térmico
Eclosão
Expressão gênica
Temperatura de incubação
Termotolerância
Poultry
Broilers - Heat stress
Hatching
Gene expression
Incubation temperature
Thermotolerance
Issue Date: 16-Sep-2022
Publisher: Universidade Federal de Lavras
Citation: LEÃO, A. P. A. Manipulação térmica durante a incubação de ovos como medida para amenizar o estresse por calor em frangos de corte. 2022. 72 p. Tese (Doutorado em Zootecnia) – Universidade Federal de Lavras, Lavras, 2022.
Abstract: Heat stress is one of the main problems faced in broiler production. Due to this, it is necessary to develop strategies that make chickens more tolerant to environmental temperature variations. Therefore, the objective was to evaluate the influence of thermal manipulation during incubation on hatch parameters, and post-hatch evaluations of productive performance, carcass characteristics, intestinal villi, nutrient metabolizability and immunological, biochemical and behavioral parameters of broilers. On the 15th day of incubation, 864 fertile eggs of the Ross® strain from a commercial hatchery were randomly assigned to four commercial automatic incubators. The treatments were: Ctrl - control, eggs kept at 37.5°C throughout the incubation period; T3h - Increase in temperature to 39°C for 3 hours on days 16, 17 and 18 of incubation; T12h - Increase in temperature to 39°C for 12 hours on days 16, 17 and 18 of incubation; and T24h - Increase in temperature to 39°C for 24 hours on days 16, 17 and 18 of incubation. After hatching, the birds were housed in the experimental shed and kept until 42 days of age. Increasing the temperature for 24 hours on days 16, 17 and 18 of incubation reduced (P<0.05) weight gain and feed intake at 42 days of age. At 24 days, lower cloacal temperature was observed (P<0.05) in birds from eggs incubated with an increase in temperature for 3 hours and a higher respiratory rate at 31 days was observed (P<0.05) when the temperature was increased for 3 or 12 hours. At 42 days, lower hematocrit was observed (P<0.05) when the incubation temperature was increased for 3 or 24 hours and higher gene expression of Hsp70 in the liver (P<0.05) when the temperature was increased for 3 hours. For the other parameters, no difference was observed between the experimental treatments. It is concluded that thermal manipulation during incubation can influence the performance and physiological characteristics related to the thermotolerance of birds. Increasing the incubation temperature to 39°C for 3 hours on days 16, 17 and 18 of incubation can be beneficial to the thermotolerance of the birds, and this temperature increase maintained for 24 hours impairs the post-hatch performance of the broilers.
URI: http://repositorio.ufla.br/jspui/handle/1/55120
Appears in Collections:Zootecnia - Doutorado (Teses)



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