Genetic polymorphisms related to meat traits in purebred and crossbred Nelore cattle

Pesquisa Agropecuária Brasileira

Rogério Abdallah Curi²  Marina Rufino Salinas Fortes¹  Luis Artur Loyola Chardulo¹  Antonio Carlos Silveira²  Mário De Beni Arrigoni²  Cyntia Ludovico Martins²  Mayra Elena Ortiz D' Avila Assumpção¹  Henrique Nunes De Oliveira² 

[1],Universidade Estadual Paulista Faculdade de Medicina Veterinária e Zootecnia Fazenda Experimental Lageado

关键词: Bos indicus;    calpain gene;    calpastatin gene;    meat tenderness;    single nucleotide polymorphisms;    Bos indicus;    gene da calpaína;    gene da calpastatina;    maciez da carne;    polimorfismos de nucleotídeo único;   

DOI  :  10.1590/S0100-204X2009001200015

来源: SciELO

【 摘 要 】

The objective of this work was to estimate the allelic and genotypic frequencies of CAST/XmnI, a calpastatin gene polymorphism, and CAPN530, a calpain 1 large subunit gene polymorphism, in different beef genetic groups (Nelore and Nelore x Bos taurus), and to investigate associations between these polymorphisms and carcass and meat traits. Three hundred animals - comprising 114 Nelore, 67 Angus x Nelore, 44 Rubia Gallega x Nelore, 41 Canchim, 19 Brangus three-way cross and 15 Braunvieh three-way cross- were genotyped by PCR-RFLP and phenotyped for rib-eye area (REA), back-fat thickness (BT), intramuscular fat (IF), shear force (SF) and myofibrillar fragmentation index (MFI). The occurrence of the two alleles of the CAST/XmnI and CAPN530 single nucleotide polymorphisms (SNPs) in a B. indicus breed, which permitted association studies in purebred and crossbred Nelore cattle, was first shown in the present work. No relationship was found between the CAST or CAPN1 SNPs and growth-related traits (REA) or fat deposition (BT and IF), since calpastatin and µ-calpain are not physiologically involved with these traits. Moreover, the association results between genotypes and aged meat tenderness (assessed by SF and MFI) showed that these markers are useless in assisted selection for purebred Nelore and their crosses with B. taurus.

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