Journal
SPANISH JOURNAL OF AGRICULTURAL RESEARCH
Volume 4, Issue 1, Pages 37-46Publisher
INST NACIONAL INVESTIGACION & TECNOLOGIA AGRARIA & ALIMENTARIA-INIA-CSIC
DOI: 10.5424/sjar/2006041-176
Keywords
clustering; MC1R gene; mixture and admixture analysis; within-breed variation
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The census and structure of Iberian pig breed have experienced important changes along the last decades. Bayesian methods based on multilocus genotypes have been applied for ascertaining the actual breed structure and for identifying genetically distinctive populations. DNA samples from 170 Iberian pigs previously assigned to the strains or varieties Torbiscal, Guadyerbas, Retinto, Entrepelado and Lampino and 64 Duroc pigs were genotyped for 36 microsatellites. A best partition of only five clusters was estimated in the clustering analysis at group level, when the previous assignation to populations was taken into account. But the individual-based assessment of population structure, ignoring the previous assignation of animals to populations, showed a more complex partition of ten clusters. Results of admixture analyses for partitioning individuals into the inferred clusters showed an important proportion of admixed individuals pre-assigned to the Retinto, Entrepelado and Lampino varieties. The frequencies of private alleles of the MC1R gene also evidenced an important genetic flow between these varieties. The future definition of conservation units in the Iberian breed should consider these results.
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