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Performance and carcass characteristics of broiler chickens with different growth potential and submitted to heat stress
Rosa, PS; Faria Filho, DE; Dahlke, F; Vieira, BS; Macari, M; Furlan, RL.
Afiliação
  • Rosa, PS; Embrapa Suínos e Aves ,Universidade do Contestado ,Universidade Estadual Paulista Faculdade de Ciências Agrárias e Veterinárias Departamento de Morfologia e Fisiologia Animal.
  • Faria Filho, DE; Universidade Federal de Minas Gerais Núcleo de Ciências Agrárias.
  • Dahlke, F; Universidade Federal do Paraná Departamento de Zootecnia.
  • Vieira, BS; Universidade Estadual Paulista Faculdade de Ciências Agrárias e Veterinárias Departamento de Morfologia e Fisiologia Animal.
  • Macari, M; Universidade Estadual Paulista Faculdade de Ciências Agrárias e Veterinárias Departamento de Morfologia e Fisiologia Animal.
  • Furlan, RL; Universidade Estadual Paulista Faculdade de Ciências Agrárias e Veterinárias Departamento de Morfologia e Fisiologia Animal.
Article em En | LILACS-Express | VETINDEX | ID: biblio-1491167
Biblioteca responsável: BR68.1
ABSTRACT
In order to evaluate the effects of broiler genotype and of heat exposure on performance, carcass characteristics, and protein and fat accretion, six hundred one-day-old male broilers were randomly assigned in a 2 x 3 factorial arrangement, according to the following factors genetic group (selected and non-selected broilers) and pair-feeding scheme (Ad32 - reared under heat stress and fed ad libitum; Ad23 - reared at thermoneutrality and fed ad libitum; Pf23 - reared at thermoneutrality and pair fed with Ad32), with a total of six treatments with four replicates of 25 birds each. Independent of pair-feeding scheme, selected broilers showed better feed conversion, higher carcass yield, and lower abdominal fat deposition rate. However, as compared to non-selected broilers, they reduced more intensively feed intake when heat exposed, which promoted significant breast-yield decrease, and more pronounced changes on carcass chemical composition. These findings allows concluding that, in both genetic groups, both environmental temperature and feed-intake restriction influence abdominal fat deposition rate and other carcass characteristics; however, the impact of heat exposure on broiler performance is more noticeable on the selected line.
Palavras-chave
Texto completo: 1 Base de dados: VETINDEX Idioma: En Revista: R. bras. Ci. avíc. / Rev. bras. ciênc. avic Ano de publicação: 2007 Tipo de documento: Article
Texto completo: 1 Base de dados: VETINDEX Idioma: En Revista: R. bras. Ci. avíc. / Rev. bras. ciênc. avic Ano de publicação: 2007 Tipo de documento: Article