Abstract

SAINZ, R. et al. Genetic structure of the Tudanca bovine breed inferred from the genealogical information. Arch. zootec. [online]. 2011, vol.60, n.231, pp.401-404. ISSN 1885-4494.  https://dx.doi.org/10.4321/S0004-05922011000300021.

The pedigree file of the Tudanca local bovine breed recovers information of animals born from 1966 to 2010 in 455 herds. The pedigree completeness level is characterised by a low number of equivalent complete generations (∼ 2). Individual inbreeding and relatedness coefficients, and effective number of founders, ancestors and founder genomes, were computed. Average effective population size was estimated based on the regression of the inbreeding on genealogical amount of information, and effective population seize for the last generation were also calculated. Using this information, medium-term inbreeding rate evolution (50 years) was predicted. A high percentage of animals (87%) with a high level of inbreeding (>6,25) was found. The effective number of founder genomes (72) and the effective number of ancestors (88) reflect the genetic base of the current population, while the medium-term loss of genetic variability predicted from the effective population size (18-29) showed a breed under a low to moderate level of genetic risk.

Keywords : Beef cattle; Pedigree.

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