Incidência de miopatia peitoral em frangos de corte de diferentes sistemas de produção

Abstract

The aim of this research was to estimate the incidence of pectoral myopathy Spaguetti breast in Pectoralis Major muscle in broilers reared in different commercial strains and facilities types. Data were collected in a broiler slaughterhouse, located in the state of Mato Grosso do Sul. The 5580 broiler breast samples were evaluated mixed (equivalent to 3% of the number of birds slaughtered of each livestock) of the two broiler houses: Dark house and tunnel system and three commercial strains: Hubbard, Cobb and Ross. The macroscopic evaluation and classification of degrees of incidence of muscle change the pectoralis major muscle was considered the following classification of breasts to myopathy Spaguetti breast: Grade 0: normal or absent, Grade 1: intermediate or moderate and Grade 2: severe. The evaluation of the production performance used: Final average weight; food conversion; average daily gain; final weight gain; feed intake; mortality; viability and productive efficiency index. The single-factor variance was used to analysis and comparisons of means by Student's t test. Birds from the Dark house system presents higher chances (26%) and risks (13%) to development changes in muscle fibers in the pectoralis than the birds of the tunnel system, indicating that birds exposed to those conditions can increase chances and risks of increased incidence of myopathy Spaguetti breast. The birds bred in aviaries dark house had higher feed intake with 10% higher. The incidence of myopathy pectoral Spaguetti breast present significant association for birds reared in Dark House facilities with greater chances and occurrence of risks of muscle change with moderate to severe.