Rates of inbreeding and genetic diversity in Iranian Holstein Cattle

被引:4
|
作者
Dadar, Mohsen [1 ]
Mahyari, Saeid Ansari [1 ]
Rokouei, Mohammad [2 ]
Edriss, Mohammd Ali [1 ]
机构
[1] Esfahan Univ Technol, Dept Anim Sci, Esfahan 8415683111, Iran
[2] Univ Zabol, Dept Anim Sci, Zabol, Iran
关键词
genetic diversity; inbreeding; Iranian Holstein; pedigree; DAIRY-CATTLE; LARGE POPULATIONS; PEDIGREE ANALYSIS; COEFFICIENTS; VARIABILITY; DEPRESSION; MANAGEMENT; TRAITS; BREEDS;
D O I
10.1111/asj.12228
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
The accumulation of inbreeding and the loss of genetic diversity is a potential problem in Holstein dairy cattle. The goal of this study was to estimate inbreeding levels and other measures of genetic diversity, using pedigree information from Iranian Holstein cattle. Edited pedigree included 1048572 animals. The average number of discrete generation equivalents and pedigree completeness index reached 13.4 and 90%, respectively. The rate of inbreeding was 0.3% per year. Effective number of founders, founder genomes, non-founders and ancestors of animals born between 2003 and 2011 were 503, 15.6, 16.1 and 25.7, respectively. It was proven that the unequal founder contributions as well as bottlenecks and genetic drift were important reasons for the loss of genetic diversity in the population. The top 10 ancestors with the highest marginal genetic contributions to animals born between 2003 and 2011 and with the highest contributions to inbreeding were 48.20% and 63.94%, respectively. Analyses revealed that the most important cause of genetic diversity loss was genetic drift accumulated over non-founder generations, which occurred due to small effective population size. Therefore, it seems that managing selection and mating decisions are controlling future co-ancestry and inbreeding, which would lead to better handling of the effective population size.
引用
收藏
页码:888 / 894
页数:7
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