Genetic parameter estimation for long endurance trials in the Uruguayan Criollo horse

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  • R. D. López-Correa, Universidad de la República
  • ,
  • F. Peñagaricano, University of Florida, Gainesville, Florida
  • ,
  • G. Rovere
  • J. I. Urioste, Universidad de la República

The aim of this study was to estimate the genetic parameters of performance in a 750-km, 15-day ride in Criollo horses. Heritability (h2) and maternal lineage effects (mt2) 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 mt2 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 pRKs 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.

TidsskriftJournal of Animal Breeding and Genetics
Sider (fra-til)186-193
Antal sider8
StatusUdgivet - 7 maj 2018

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