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Genetic parameter estimation for long endurance trials in the Uruguayan Criollo horse
Author(s) -
LópezCorrea R.D.,
Peñagaricano F.,
Rovere G.,
Urioste J.I.
Publication year - 2018
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.12324
Subject(s) - heritability , biology , genetic correlation , zoology , genetic variation , veterinary medicine , genetics , gene , medicine
Summary The aim of this study was to estimate the genetic parameters of performance in a 750‐km, 15‐day ride in Criollo horses. Heritability ( h 2 ) and maternal lineage effects (mt 2 ) were obtained for rank, a relative placing measure of performance. Additive genetic and maternal lineage (rmt) correlations among five medium‐to‐high intensity phase ranks ( pRK ) and final rank ( RK ) were also estimated. Individual records from 1,236 Criollo horses from 1979 to 2012 were used. A multivariate threshold animal model was applied to the pRK and RK . Heritability was moderate to low (0.156–0.275). Estimates of mt 2 were consistently low (0.04–0.06). Additive genetic correlations between individual pRK and RK were high (0.801–0.924), and the genetic correlations between individual pRK s ranged from 0.763 to 0.847. The pRK heritabilities revealed that some phases were explained by a greater additive component, whereas others showed stronger genetic relationships with RK . Thus, not all pRK may be considered as similar measures of performance in competition.