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Genetic Indicators of Performance Resilience in Barrel Racing Quarter Horses.

Mário Luiz Santana¹, Annaiza Braga Bignardi¹

¹Grupo de Melhoramento Animal de Mato Grosso (GMAT), Instituto de Ciências Agrárias e Tecnológicas (ICAT), Universidade Federal de Rondonópolis (UFR), Rondonópolis, Brazil.

Animal Genetics

|July 7, 2026

Summary

Breeding for resilience in horses, using barrel racing data, can improve performance consistency. Genetically resilient horses show faster times and higher earnings, offering a new breeding objective for sport horses.

Keywords:

career earnings genetic parameters genotype by environment interaction speed sport horse stability

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Area of Science:

Animal Genetics
Equine Performance Science
Quantitative Genetics

Background:

Resilience is crucial for livestock but understudied in horses.
Consistent performance under varying conditions is key for sport animals.
Barrel racing time (BRT) records offer longitudinal data for resilience assessment.

Purpose of the Study:

Derive resilience indicators from BRT records in Brazilian Quarter Horses.
Estimate genetic parameters for these resilience indicators.
Quantify genetic relationships between resilience, BRT, and career earnings (ACE).

Main Methods:

Utilized BRT data from 10,665 horses (2010-2024).
Calculated resilience indicators: median absolute deviation (MAD), log variance (LNVAR), and proportion of positive deviations (PPOS).
Estimated genetic parameters and correlations using longitudinal performance data.

Main Results:

Low heritability (0.06-0.09) for resilience indicators, indicating exploitable genetic variation.
High genetic correlation between MAD and LNVAR (0.987); PPOS captured distinct genetic information.
Favorable genetic correlations with ACE (mean -0.59) and BRT (mean 0.44).

Conclusions:

Resilience indicators derived from performance data capture meaningful genetic variation.
Genetically resilient horses demonstrate improved speed and economic success.
These indicators offer a framework for incorporating resilience into sport horse genetic evaluations.