Population structure of the registered Indubrasil cattle in Brazil

A. E. Vercesi Filho; F. Carvalho Faria; Fernando E. Madalena; L. A. Josahkian

A. E. Vercesi Filho Universidade Federal de Minas Gerais, Belo Horizonte, Brasil
F. Carvalho Faria Universidade Federal de Minas Gerais, Belo Horizonte, Brasil
Fernando E. Madalena Universidade Federal de Minas Gerais, Belo Horizonte, Brasil
L. A. Josahkian Associação Brasileira de Criadores de Zebu,Uberaba-MG, Brasil

Abstract

The aim of this study was to describe the population structure of the registered Indubrasil cattle in Brazil. Descriptive statistics of the distribution of the number of progeny, the generation interval, F-statistics, effective number of founders, ancestors, reminiscent genomes and effective population size were estimated using pedigree records from animals registered between 1938-1998. In the last period studied (1994-1998) 3.673 animals, 1.753 males and 1.920 females belonging to 84 breeders were registered. The generations intervals calculated in each of the four periods 1979-1983, 1984-1988, 1989-1993 and 1994-1998 were, respectively, 7,27; 7,57; 7,83 and 7,45 yr. The effective size of the population, founders, ancestors and reminiscent genomes in each of these periods were respectively: 63, 40, 35 e 42; 458, 417, 278 e 181; 349, 284, 176 e 107; 240, 189, 114 e 65.

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