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Effects of cold stress on physiologic metabolism in the initial phase and performance of broiler rearing.
Moreira, Ludmyla Martins; Sousa, Lorena Salim; Guamán, César Andrés Guato; Vieira, Mariana Cristina; Santini, Matheus Barros; Cardoso, Alexandre Rodrigues; Leme, Fabíola de Oliveira Paes; Lara, Leonardo José Camargos; Araújo, Itallo Conrado Sousa.
Afiliação
  • Moreira LM; Department of Animal Science, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
  • Sousa LS; Department of Animal Science, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
  • Guamán CAG; Department of Animal Science, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
  • Vieira MC; Department of Animal Science, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
  • Santini MB; Department of Animal Science, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
  • Cardoso AR; Department of Animal Science, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
  • Leme FOP; Department of Animal Science, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
  • Lara LJC; Department of Animal Science, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
  • Araújo ICS; Department of Animal Science, Universidade Federal de Minas Gerais, Minas Gerais, Brazil. Electronic address: italloconradovet@hotmail.com.
J Therm Biol ; 119: 103773, 2024 Jan.
Article em En | MEDLINE | ID: mdl-38181614
ABSTRACT
This study aimed to investigate the effects of 8 h of cold stress (18 °C) every day in broiler chicks during the first 7 days of rearing on crop filling analysis, yolk sac consumption, digestive and immune organs weights, and physiological metabolism at seven days and performance between 1 and 35 days. Cobb500 male broiler chickens (n = 274) were randomly assigned to two treatments. The treatments consisted of varying environmental temperatures during the first week post-housing. Chicks were reared at a thermoneutral temperature (32 °C) or under cold stress (18 °C) for 8 h/day during the first week, and both groups were subsequently reared at a thermoneutral temperature for 8-35 days. The thermoneutral group reached 90% full crop after 48 h of housing (P < 0.05), while the cold-stressed group had more empty crops at 2 h and 48 h after housing (P < 0.05). The chick cloacal temperature was not affected by the treatments (P > 0.05). Additionally, the treatment did not affect serum amylase and corticosterone levels, feed intake, body weight gain, or feed conversion ratio (P > 0.05, while the cold-stressed group had elevated heterophil/lymphocyte count at day 7 (P < 0.05). The thermoneutral group showed higher viability (%) at 7 and 35 days and a higher production factor at 35 days (P < 0.05). Broiler chickens under cyclic cold stress experienced decreased yolk sac absorption during the first week and increased feed intake and feed conversion ratio after 35 days of rearing. Viability was also lower in the cold-stressed group. An appropriate strategy to minimize these adverse effects is to rear the chicks in a thermoneutral environment during the first week.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Galinhas / Resposta ao Choque Frio Limite: Animals Idioma: En Revista: J Therm Biol Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Galinhas / Resposta ao Choque Frio Limite: Animals Idioma: En Revista: J Therm Biol Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido