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Admixture analysis in relation to pedigree studies of introgression in a minority B ritish cattle breed: the L incoln R ed
Author(s) -
Bray T.C.,
Hall S.J.G.,
Bruford M.W.
Publication year - 2014
Publication title -
journal of animal breeding and genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.689
H-Index - 51
eISSN - 1439-0388
pISSN - 0931-2668
DOI - 10.1111/jbg.12047
Subject(s) - breed , introgression , population , approximate bayesian computation , bayesian probability , biology , population structure , statistics , genetics , mathematics , demography , gene , sociology
Summary Investigation of historic population processes using molecular data has been facilitated by the use of approximate Bayesian computation ( ABC ), which enables the consideration of multiple alternative demographic scenarios. The Lincoln Red cattle breed provides a relatively simple example of two well‐documented admixture events. Using molecular data for this breed, we found that structure did not resolve very low (<5% levels) of introgression, possibly due to sampling limitations. We evaluated the performance of two ABC approaches (2 BAD and DIYABC ) against those of two earlier methodologies, ADMIX and LEADMIX , by comparing their interpretations with the conclusions drawn from herdbook analysis. The ABC methods gave credible values for the proportions of the L incoln R ed genotype that are attributable to A berdeen A ngus and L imousin, although estimates of effective population size and event timing were not realistic. We suggest ABC methods are a valuable supplement to pedigree‐based studies but that the accuracy of admixture determination is likely to diminish with increasing complexity of the admixture scenario.