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

TY - JOUR

T1 - Genetic parameter estimation for long endurance trials in the Uruguayan Criollo horse

AU - López-Correa, R. D.

AU - Peñagaricano, F.

AU - Rovere, G.

AU - Urioste, J. I.

PY - 2018/5/7

Y1 - 2018/5/7

N2 - 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.

AB - 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.

KW - Endurance

KW - Genetic correlation

KW - Heritability

KW - Horse

KW - Rank

UR - http://www.scopus.com/inward/record.url?scp=85046554531&partnerID=8YFLogxK

U2 - 10.1111/jbg.12324

DO - 10.1111/jbg.12324

M3 - Journal article

C2 - 29732622

AN - SCOPUS:85046554531

SN - 0931-2668

VL - 135

SP - 186

EP - 193

JO - Journal of Animal Breeding and Genetics

JF - Journal of Animal Breeding and Genetics

IS - 3

ER -