Genetic improvement and population structure of the Nelore breed in Northern Brazil

Pesquisa Agropecuária Brasileira

Carlos Henrique Mendes Malhado²  Paulo Luiz Souza Carneiro²  Ana Claudia Mendes Malhado¹  Raimundo Martins Filho¹  Riccardo Bozzi¹  Richard James Ladle¹ 

[1] ,Universidade Estadual do Sudoeste da Bahia Departamento de Ciências Biológicas Jequié BA ,Brazil

关键词: Bos taurus indicus;    effective population size;    genetic parameters;    genetic trends;    inbreeding;    pedigree analysis;    Bos taurus indicus;    tamanho efetivo da população;    parâmetros genéticos;    tendência genética;    endogamia;    análise de pedigree;   

DOI  :  10.1590/S0100-204X2010001000009

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the population structure and the genetic and phenotypic progress of Nelore cattle in Northern Brazil. Pedigree information concerning animals born between 1942 and 2006 were analyzed. Population structure was performed using the Endog program. Out of the 140,628 animals studied, 67.7, 14.52 and 3.18% had complete pedigree record of the first, second and third parental generation, respectively. Inbreeding and average relatedness coefficients were low: 0.2 and 0.13%, respectively. However, these parameters may have been underestimated, since information on pedigree was incomplete. The effective number of founders was 370 and the genetic contribution of 10, 50 and 448 most influent ancestors explained 13.2, 28 and 50% of the genetic variability in the population, respectively. The genetic variability for growth traits and population structure demonstrates high probability of increasing productivity through selective breeding. Moreover, management strategies to reduce the currently observed age at first calving and generation intervals are important for Nelore cattle genetic improvement.

【 授权许可】

CC BY   
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