Quantitative-genetic study of muscle fibers of number and diameter in a male broiler line / Estudo genético-quantitativo de número e diâmetro de fibras musculares em linhagem macho de frangos

AUTOR(ES)

Andrezza Maria Felício

DATA DE PUBLICAÇÃO

2008

RESUMO

This research was conducted to estimate genetic and phenotypic parameters of muscle fibers of number, diameter and area, as well as of performace, carcass and meat quality traits in a male broiler line belonging to a program of selection of the type sib test, in which data from complete brothers of the individuals were selected, bred in a pedigree flock provided by Agroceres Ross Melhoramento de Aves S. A. Also were provided by the company 73,142 and 34,949 data concerning body weight at juvenile selection and ultrasound records of pectoral muscle, respectively. The traits analyzed were: body weight at juvenile selection (PS), ultrasound records of pectoral muscle (US), meat breast weight (PPEI), initial pH measure (pHi), final pH measure (pHf), lightness (L*), redness (a*), yellowness (b*), weep losses (EXSU), drip losses (CONG), shrik losses (COZ), shear force (FC), muscle fibers of number (NCel), muscle fibers of diameter and muscle fibers area (AREA). (Co) variance components were estimated by restricted maximum likelihood method, using the software MTDFREML. The numerator relationship matrix was composed by 77,474 individuals. Heritability coefficients estimates were from moderate to high for muscle fibers number, ultrasound records, meat breast weight, weep losses, lightness and redness traits. Genetic correlation estimates of muscle fibers number and diameter with the measures of meat water losses and shear force traits indicated the existence of an important genetic association between the traits, capable to present potential satisfactory respond to the selection.

ASSUNTO(S)

características histológicas meat quality animal breeding melhoramento animal fenotípicos qualidade de carne histological traits parâmetros genéticos genetic and phenotypic parameters

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