考虑体况评分的成熟牛体重遗传评价递归模型与替代模型的比较分析。

IF 1.9 3区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Ayooluwa O Ojo, Henrique A Mulim, Andre Garcia, Kelli Retallick-Riley, Stephen P Miller, Hinayah R Oliveira
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引用次数: 0

摘要

成熟牛的大小,通常由成熟牛体重(MWT)、身高(MHT)和体况评分(BCS)来定义,对犊牛盈利能力、维持效率和繁殖性能至关重要。尽管许多品种组织经常将MWT和MHT纳入国家牛群评估,但BCS调整的应用不太一致。本研究调查了不同建模方法对MWT育种值估计的影响,重点是如何在不同模型中考虑BCS。美国安格斯协会提供的数据集包括来自209,491头奶牛的382,156条MWT和BCS记录。评估了四种建模方法:模型1不考虑BCS;模型2将BCS视为类别固定效应;模型3采用BCS和年龄标准化的预调整记录;模型4使用递归模型来评估MWT是否独立于BCS的遗传性状。不同模型预测的繁殖值之间的Spearman相关性从0.79(模型1和4之间)到0.95(模型1和2之间)不等,表明5%-21%的公牛可能有不同的排名,这取决于所使用的模型。对每个模型中前10%的配种进行一致性评估,模型对比较显示差异从19%(模型1和2之间)到40%(模型3和4之间)不等。这些差异突出了模型选择影响选择结果的潜力。模型选择可以显著影响配种排名,这突出了仔细选择最符合选择目标和被评估性状的潜在生物学特性的模型的重要性。尽管模型4在理论上具有优势,但由于没有进行模拟,因此本研究不能对其总体有效性得出明确的结论。需要进一步的研究来证实其优势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparative Analysis of Recursive and Alternative Modelling Approaches Considering Body Condition Score for Genetic Evaluation of Mature Cow Weight.

Mature cow size, often defined by mature cow weight (MWT), height (MHT) and body condition score (BCS), is crucial to cow-calf profitability, maintenance efficiency and reproductive performance. Although MWT and MHT are often included in national cattle evaluations by many breed organisations, BCS adjustments are applied less consistently. This study investigated the impact of different modelling approaches on the estimation of breeding values for MWT, with a focus on how BCS is accounted for across models. The dataset provided by American Angus Association comprised 382,156 MWT and BCS records from 209,491 cows. Four modelling approaches were evaluated: Model 1 does not consider BCS; Model 2 treated BCS as a categorical fixed effect; Model 3 used pre-adjusted records standardised for BCS and age; and Model 4 used a recursive model to assess MWT as a genetically independent trait from BCS. Spearman correlations between breeding values predicted across models ranged from 0.79 (between Models 1 and 4) to 0.95 (between Models 1 and 2), indicating that 5%-21% of bulls could have different rankings depending on the model used. Concordance in sire selection was assessed between the top 10% of sires in each model, and model-pair comparison revealed differences ranging from 19% (between Models 1 and 2) to 40% (between Models 3 and 4). These differences highlight the potential for model choice to influence the selection outcomes. Model selection can significantly affect the sire rankings, highlighting the importance of carefully selecting the model that best aligns with the selection objectives and the underlying biology of the traits being evaluated. Although Model 4 offers theoretical advantages, this study does not allow for a definitive conclusion on its overall effectiveness, as no simulations were performed. Additional research is needed to confirm its advantages.

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来源期刊
Journal of Animal Breeding and Genetics
Journal of Animal Breeding and Genetics 农林科学-奶制品与动物科学
CiteScore
5.20
自引率
3.80%
发文量
58
审稿时长
12-24 weeks
期刊介绍: The Journal of Animal Breeding and Genetics publishes original articles by international scientists on genomic selection, and any other topic related to breeding programmes, selection, quantitative genetic, genomics, diversity and evolution of domestic animals. Researchers, teachers, and the animal breeding industry will find the reports of interest. Book reviews appear in many issues.
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