结合基因组信息的内洛牛胴体超声测量性状与精液质量性状的遗传相关性

IF 1.9 3区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Camila S. Mussi , Gabriel C. Medeiros , Rafael Espigolan , Fernando Baldi , Marcio R. Silva , José D. Guimarães , Elisangela C. Matos , Joanir P. Eler , Tamires Miranda Neto , José Bento S. Ferraz , Luiz F. Brito
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引用次数: 0

摘要

内洛牛(巴西牛)是巴西饲养的主要肉牛品种,在全球牛肉市场上具有重要的经济意义。超声技术常用来测量胴体性状,为活体动物的遗传评价和肉质指标提供了方便。精液质量和阴囊周长性状评价的雄性生殖效率直接影响农场的盈利能力。本研究估计了内洛牛超声胴体、精液质量和阴囊周长性状的变异成分和遗传相关性。我们使用了116,011只动物的数据集,其中有表型记录,13,632只基因分型动物,以及635,175只动物的谱系。18个月和24个月阴囊周长的遗传率估计为中等(分别为0.39±0.008和0.38±0.02)。精液质量性状(活力、活力和质量活性)的遗传系数在0.03±0.01 ~ 0.05±0.01之间,遗传系数较低。精子缺陷的遗传力估计也很低,范围在0.01±0.007到0.12±0.02之间。胴体性状(肋眼面积和臀部脂肪厚度)的遗传力为中等(0.34±0.05和0.39±0.06),皮下脂肪厚度的遗传力为0.18±0.04。胴体与精液质量和阴囊周长性状的遗传相关性为低至中等,且不显著。这些发现表明,胴体性状可以通过遗传选择得到改善,而与精子质量性状和阴囊周长性状的遗传相关性普遍较低,这表明超声技术测量的胴体性状的选择对精液质量的影响微乎其微。因此,建议同时选择这两个性状组,以确保内洛牛育种计划中最佳的长期遗传改良。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Genetic correlations between carcass traits measured by ultrasonography and semen quality traits in Nellore cattle incorporating genomic information
Nellore cattle (Bos taurus indicus), the predominant beef cattle breed raised in Brazil, has substantial economic importance in the global beef market. Ultrasonography is commonly used to measure carcass traits, which facilitate the genetic evaluation of live animals and provides indicators of meat quality. Male reproductive efficiency assessed by semen quality and scrotal circumference traits directly influences farm profitability. This study estimated variance components and genetic correlations between ultrasound-based carcass and semen quality and scrotal circumference traits in Nellore cattle. We used a dataset of 116,011 animals with phenotypic records, 13,632 genotyped animals, and a pedigree with 635,175 animals. Heritability estimates for scrotal circumference at 18 and 24 months were moderate (0.39 ± 0.008 and 0.38 ± 0.02, respectively). Semen quality traits, including motility, vigor, and mass activity were found to be lowly heritable with estimates ranging from 0.03 ± 0.01 to 0.05 ± 0.01. The heritability estimates for sperm defects were also low and ranged from 0.01 ± 0.007 to 0.12 ± 0.02. Carcass traits, including ribeye area and rump fat thickness, were moderately heritable (0.34 ± 0.05 and 0.39 ± 0.06), while subcutaneous fat thickness had a heritability of 0.18 ± 0.04. Genetic correlations between carcass with semen quality and scrotal circumference traits were of low to moderate magnitude and unfavorable. These findings indicate that carcass traits can be improved through genetic selection and the generally low genetic correlations with sperm quality traits and scrotal circumference traits suggest that selection for improved carcass traits, measured using ultrasonography technology, is expected to have minimal impact on semen quality. Therefore, simultaneous selection for both trait groups is recommended to ensure optimal long-term genetic improvement in Nellore cattle breeding programs.
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来源期刊
Livestock Science
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.
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