Genetic diversity and population structure of Brazilian native bovine breeds

Pesquisa Agropecuária Brasileira

Germana Maria Serrano²  Andréa Alves Do Egito¹  Concepta Mcmanus²  Arthur Da Silva Mariante¹ 

[1] ,Universidade de Brasília Fac. de Agronomia e Medicina Veterinária Brasília DF

关键词: animal conservation;    cattle;    genetic characterization;    RAPD;    conservação animal;    bovino;    caracterização genética;    RAPD;   

DOI  :  10.1590/S0100-204X2004000600005

来源: SciELO

【 摘 要 】

Conservation and improvement strategies should be based on the association between genetic and phenotypic characteristics. The objective of this work was to characterize five native Brazilian cattle breeds (Caracu, Crioulo Lageano, Curraleiro, National Polled and Pantaneiro) and two commercial breeds (Holstein and Nellore) using RAPD technique to estimate genetic distances and variability between and within breeds. Genetic relationships were investigated using 22 primers which generated 122 polymorphic bands. Analysis of molecular variance indicated that most of the genetic variation lay among individuals within populations. The genetic variabilities between pairs of breeds were statistically significant. The smallest genetic divergence was between Crioulo Lageano and Curraleiro.The National Polled, although historically considered to be of Bos taurus aquitanicus origin,similar to theCaracu, was grouped together with the other breeds of Bos taurus ibericus origin. Generally, the individual breeds formed distinct clusters except the National Polled. The RAPD technique was capable to distinguish genetically between the breeds studied; the Caracu, Crioulo Lageano, Curraleiro and Pantaneiro may be considered distinct genetic entities thereby proving the uniqueness of the populations; the National Polled has not been able to re-establish itself after its decline in the 1950s, thereby losing its genetic identity.

【 授权许可】

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