分析沿羊毛短纤维测量的纤维直径的遗传变异,以作为绵羊抗逆性的潜在指标

IF 3.6 1区 农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Erin G. Smith, Dominic L. Waters, Samuel F. Walkom, Sam A. Clark
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引用次数: 0

摘要

环境干扰对家畜的影响通常是通过长期重复性能记录的变化模式间接观察到的。绵羊经常暴露在多种多样的广阔环境中,但目前缺乏适当的方法来衡量其对环境干扰的适应性(或敏感性)。本研究采用随机回归模型分析沿羊毛短纤维(羊毛纤维束)采集的羊毛纤维直径的重复记录,以研究纤维直径的遗传和环境变异如何随不同的生长环境而变化。一个包含五阶、四阶和二阶 Legendre 多项式的模型分别适用于固定效应、加法效应和永久环境效应,是沿羊毛短纤维建立纤维直径模型的最佳选择。附加遗传变异和永久环境变异都显示了整个短绒长度轨迹的可变性。纤维直径的母系估计育种值(EBV)的排序随着短绒长度的变化而变化,遗传相关性随着短绒长度测量间距的增加而降低。这一结果表明,与其他基因型相比,某些基因型对生长环境变化的适应能力更强。此外,随机回归模型的特征函数暗示了改变纤维直径轨迹以减少其沿羊毛短纤变化的能力。这些结果表明,沿羊毛主干测量纤维直径的遗传变异是存在的,这可用于更深入地了解在广泛饲养的绵羊种群中选择抗逆性的能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of the genetic variance of fibre diameter measured along the wool staple for use as a potential indicator of resilience in sheep
The effects of environmental disturbances on livestock are often observed indirectly through the variability patterns of repeated performance records over time. Sheep are frequently exposed to diverse extensive environments but currently lack appropriate measures of resilience (or sensitivity) towards environmental disturbance. In this study, random regression models were used to analyse repeated records of the fibre diameter of wool taken along the wool staple (bundle of wool fibres) to investigate how the genetic and environmental variance of fibre diameter changes with different growing environments. A model containing a fifth, fourth and second-order Legendre polynomial applied to the fixed, additive and permanent environmental effects, respectively, was optimal for modelling fibre diameter along the wool staple. The additive genetic and permanent environmental variance both showed variability across the staple length trajectory. The ranking of sire estimated breeding values (EBV) for fibre diameter was shown to change along the staple and the genetic correlations decreased as the distance between measurements along the staple increased. This result suggests that some genotypes were potentially more resilient towards the changes in the growing environment compared to others. In addition, the eigenfunctions of the random regression model implied the ability to change the fibre diameter trajectory to reduce its variability along the wool staple. These results show that genetic variation in fibre diameter measured along the wool staple exists and this could be used to provide greater insight into the ability to select for resilience in extensively raised sheep populations.
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来源期刊
Genetics Selection Evolution
Genetics Selection Evolution 生物-奶制品与动物科学
CiteScore
6.50
自引率
9.80%
发文量
74
审稿时长
1 months
期刊介绍: Genetics Selection Evolution invites basic, applied and methodological content that will aid the current understanding and the utilization of genetic variability in domestic animal species. Although the focus is on domestic animal species, research on other species is invited if it contributes to the understanding of the use of genetic variability in domestic animals. Genetics Selection Evolution publishes results from all levels of study, from the gene to the quantitative trait, from the individual to the population, the breed or the species. Contributions concerning both the biological approach, from molecular genetics to quantitative genetics, as well as the mathematical approach, from population genetics to statistics, are welcome. Specific areas of interest include but are not limited to: gene and QTL identification, mapping and characterization, analysis of new phenotypes, high-throughput SNP data analysis, functional genomics, cytogenetics, genetic diversity of populations and breeds, genetic evaluation, applied and experimental selection, genomic selection, selection efficiency, and statistical methodology for the genetic analysis of phenotypes with quantitative and mixed inheritance.
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