Características quali quantitativas da carne e da carcaça de bovinos Nelore Mocho pertencentes a uma população segregante selecionada para maciez

• Autor(a) principal: Moreira, Ligia da Cunha
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/001300000b681
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/4317
• topic: Carcaça; Cobertura de gordura; Maciez da carne; Seleção genética; Warner-Bratzler Shear Force (WBSF); Carcass; Fat thickness; Tenderness; Genetic selection; ZOOTECNIA::PRODUCAO ANIMAL

Genetic selection of animals with potential for improved carcass and meat quality is a strategy that should be employed in Brazilian livestock. The country occupies a prominent position in global agribusiness, possessing the largest commercial cattle herd in the world and being one of the largest exporters of beef. However, Brazilian beef is classified as medium to low quality. The aim of the present study was to evaluate quantitative and qualitative characteristics of the carcass and beef in Polled Nellore belonging to a segregating population selected for meat tenderness. There were 68 male animals, with age average six months and initial weights 215.5 kg. The animals were slaughtered when they reached a minimum weight of 500 kg and 5 millimeters of fat backfat, forming groups of 17 or 18 animals of each slaughter. The slaughter occurred in a commercial slaughterhouse under Federal Inspection (SIF 431). The experimental design was a randomized block design with two treatment types (low and high WBSF). Data were subjected to an analysis of variance using the GLM procedure in SAS. The treatment means were compared by the Duncan test at 5% significance. Sensory analyses were submitted to the NPAR1WAY procedure, and means were compared by the non-parametric Kruskal- Wallis test. There weren’t significant differences for the carcasses characteristics evaluated. The shear force was high for animals with high WBSF analyzed in both methods (1.55 kgf and 2.48 kgf texturometer Warner Bratzler). The high group WBSF had a value of 5.99 for pH, higher than the low group WBSF, which showed a pH of 6.36. The animals of the low WBSF group had lower cooking losses, 18.1% and higher water retention capacity of 77.01%. It is suggested that these differences may have been due to the high pH value observed for animals in this group. Color parameters were better for animals with high WBSF. In the sensory panel, the animals with low WBSF were better for both, tenderness (8.38 vs. 5.01) and juiciness (6.12 vs. 5.26), compared to the high WBSF group. The two groups did not differ in carcass characteristics, but animals with low WBSF produced superior beef according to objective and taste panel evaluations. Genetic selection for meat tenderness didn’t influence carcass characteristics, but was effective