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首页> 外文期刊>Tropical Animal Health and Production >Population structure and genetic diversity in Colombian Simmental cattle
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Population structure and genetic diversity in Colombian Simmental cattle

机译：哥伦比亚群体牛群结构与遗传多样性

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摘要

A vital requirement to design and implement a breeding program is to know the structure and genetic diversity of a population. The aim of this study was to characterize population structure and genetic diversity of the Colombian Simmental cattle. The pedigree file included 27,985 animals born from 1975 to 2017. The level of genetic diversity and breed structure was evaluated through probabilities of gene origin expressed via effective number of founders, ancestors and founders genomes. The inbreeding rates and the degree of genetic connectivity were estimated using a regression analysis and a genetic drift variance analysis, respectively. The lowest effective number of founders and ancestors were 50 and 38 by year, respectively. The average inbreeding by year of birth decreased from 5.06% in 1980 to 2.25% in 2017. The dairy line genetic contributions in the overall population increased significantly in the last 37 years, and the beef line contribution decreased. Regarding the genetic connectivity, Colombian regions (administrative divisions) with the largest cattle population had higher values. The results indicate that the availability of European and North American bulls contributes to genetic diversity by increasing the effective number of founders over time in the Colombian Simmental cattle population. However, the intensive use of relatively few founders causes an unbalanced genetic contribution and the loss of genetic diversity by gene pool erosion.
机译：设计和实施育种计划的重要要求是了解人口的结构和遗传多样性。本研究的目的是表征哥伦比亚西门特牛的人口结构和遗传多样性。血统文件包括1975年至2017年出生的27,985名动物。通过通过有效创始人，祖先和创始者基因组的基因来源表达的基因来源的概率来评估遗传多样性和品种结构的水平。使用回归分析和遗传漂移方差分析估计近溴和遗传连接程度。最低有效数量的创始人和祖先分别为50岁和38年。在出生年份的平均近亲繁殖从1980年的5.06％下降到2017年的2.25％。在过去的37年里，整体人口的乳制品线遗传贡献显着增加，牛肉线贡献减少了。关于遗传连通性，最大牛群的哥伦比亚地区（行政区划）具有较高的价值。结果表明，欧洲和北美公牛的可用性通过增加哥伦比亚西门特牛群的有效创始人的有效创始人而有助于遗传多样性。然而，相对较少的创始人的密集使用引起了不平衡的遗传贡献和基因池侵蚀的遗传多样性。

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