Analysis of restriction fragment length polymorphism in the kappa-casein gene related to weight expected progeny difference in Nellore cattle

Genetics and Molecular Biology

Fernando H. Biase¹  Analia Del V. Garnero¹  Luiz A.f. Bezerra¹  Arthur J.m. Rosa¹  Raysildo B. Lôbo¹  Lúcia Martelli¹ 

[1] ,Universidade de São Paulo Faculdade de Medicina de Ribeirão Preto Departamento de GenéticaRibeirão Preto SP ,Brazil

关键词: bovine;    weight;    kappa-casein;    genetic marker;   

DOI  :  10.1590/S1415-47572005000100014

来源: SciELO

【 摘 要 】

Restriction fragment length polymorphism (RFLP) has been detected at the bovine kappa-casein locus. The polymorphism has been analyzed for its effects in cattle production, mostly for milk traits and even for maternal effect on pre-weaning weights. We used polymerase chain reaction - restriction fragment length polymorphism (PCR-RFLP) to genotype 408 Nellore animals for the non-silent mutation (Thr/Ile136 and Asp/Ala148) that characterizes the A and B variants of the polymorphism and compared expected progeny difference (EPD) for a maternal effect on 120 and 210 days weights and direct EPD for 120, 210, 450 and 550 day weight between AA and AB animals. The EPD values were obtained from the University of São Paulo (Brazil) Nellore Cattle Breeding Program, which evaluated 266,272 animals in 2001. Analysis of Variance was used to compare weight expected progeny differences (EPDs) between animals genotyped as AA and AB. The A allele frequency was 0.911. Although the AA animals had higher weight EPDs than AB animals the differences were not statistically significant (p > 0.05).

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