Population structure of Nellore cattle in northeastern Brazil

Revista Brasileira de Zootecnia

Ana Carla Borges Barbosa²  Carlos Henrique Mendes Malhado²  Paulo Luiz Souza Carneiro²  Lorena Mirelle Santos Muniz²  Diego Pagung Ambrosini²  José Adrián Carrillo¹  Raimundo Martins-filho¹ 

[1] ,Universidade Estadual do Sudoeste da Bahia,Brazil

关键词: effective size;    generation intervals;    inbreeding;    pedigree;   

DOI  :  10.1590/S1516-35982013000900005

来源: SciELO

【 摘 要 】

The objective of this study was to evaluate the population genetic structure of Nellore cattle in northeastern Brazil. Pedigree information was collected from 175,231 animals born from 1967 to 2007. Probability of gene origin, inbreeding, average relatedness coefficient (AR), completeness pedigree, effective population size and generation interval were calculated. Generation interval was high due to the long period of time animals were used as reproducers. The bottleneck effect was evidenced as a result of intensive use of limited breeders over the last years. Low values were observed ​​in the effective number of founder animals (434) and ancestors (427) comparing with the number on the base (175,231) and reference populations (130,038). Generally, the variability explained by the founders and ancestors is considered low. The average coefficient of inbreeding (0.11%) and AR (0.14%) estimated for this population is considered low and can be partly explained by the increased population effective number in recent periods; however, it may be underestimated by shallow pedigree.

【 授权许可】

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