Fast across all distances: Genetic parameters and selection for racing time in Quarter Horses using a random regression model

IF 1.9 3区农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Livestock Science Pub Date : 2025-02-01 DOI:10.1016/j.livsci.2025.105653

Thiago G.B. Franco , Annaiza B. Bignardi , Ricardo A.S. Faria , Antônio R. Silva , Josineudson A.II V. Silva , Mário L. Santana

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Abstract

The Quarter Horse, renowned for its exceptional speed and versatility, is one of the most prominent breeds in short-distance racing. Despite this, there is a lack of studies on the performance of these animals across different distances, particularly using an approach that accounts for the longitudinal nature of racing performance. Our objectives in this study were to apply a random regression model (RRM) to estimate genetic parameters for racing time (RT) at different distances in Brazilian Quarter Horses and to examine the genetic trends in performance over recent years. A total of 21,173 records from 4,482 horses that competed in races of varying distances were used. The heritability and repeatability estimates ranged from 0.05 ± 0.02 to 0.22 ± 0.03 and from 0.17 ± 0.02 to 0.48 ± 0.04 for shorter to longer distances, respectively. The genetic correlations for RT between different race distances were very high and positive, with the lowest correlation observed between the 275 m and 402 m distances (0.84 ± 0.12). The RRM effectively identified animals with stable and variable genetic merit across distances. Genetic trends for RT were favorable across races of all distances. Selecting for RT in longer distances may enhance speed across all distances. This longitudinal evaluation proved effective for analyzing performance, revealing important genetic progress in the Brazilian Quarter Horse population, particularly in 402 m races.

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快速跨越所有距离：使用随机回归模型的四分之一马的比赛时间的遗传参数和选择

夸特马以其非凡的速度和多功能性而闻名，是短距离比赛中最突出的品种之一。尽管如此，缺乏对这些动物在不同距离上的表现的研究，特别是使用一种方法来解释赛车表现的纵向性质。在这项研究中，我们的目标是应用随机回归模型（RRM）来估计巴西四分之一马在不同距离上的比赛时间（RT）的遗传参数，并检查近年来表现的遗传趋势。共有来自4,482匹马参加不同距离比赛的21,173项记录被使用。遗传率和重复率分别为0.05±0.02 ~ 0.22±0.03和0.17±0.02 ~ 0.48±0.04。不同种距之间的遗传相关性非常高且呈正相关，其中275 m和402 m之间的遗传相关性最低（0.84±0.12）。RRM有效地识别出具有稳定和可变遗传优点的动物。RT的遗传趋势在所有距离的种族中都是有利的。选择长距离RT可以提高所有距离的速度。这种纵向评估被证明对分析表现是有效的，揭示了巴西四分之一马种群的重要遗传进展，特别是在4.02亿种马中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Livestock Science 农林科学-奶制品与动物科学

CiteScore

4.30

自引率

5.60%

发文量

237

审稿时长

3 months

期刊介绍： Livestock Science promotes the sound development of the livestock sector by publishing original, peer-reviewed research and review articles covering all aspects of this broad field. The journal welcomes submissions on the avant-garde areas of animal genetics, breeding, growth, reproduction, nutrition, physiology, and behaviour in addition to genetic resources, welfare, ethics, health, management and production systems. The high-quality content of this journal reflects the truly international nature of this broad area of research.