Corporación Colombiana de Investigación Agropecuaria - Agrosavia, Mosquera, Cundinamarca, Colombia.
Trop Anim Health Prod. 2023 May 3;55(3):185. doi: 10.1007/s11250-023-03574-8.
Analyses of the genetic diversity of indigenous cattle are essential for implementing conservation programs, promoting their sustainable use and maintaining productive advantages offered by these breeds in local conditions. The aim of this study was to investigate the genetic diversity and population structure of six Colombian cattle breeds: Blanco Orejinegro (BON), Costeño con Cuernos (CCC), Romosinuano (ROM), Sanmartinero (SAM), Casanareño (CAS), and Hartón del Valle (HDV). Two additional breed groups were included for comparison: Zebu (CEB) and a crossbreed of Colombian cattle breeds × Zebu. Genetic diversity within breeds was analyzed using expected heterozygosity (He), inbreeding coefficient (f), and runs of homozygosity (ROH). Population structure was assessed using model-based clustering (ADMIXTURE) and principal components analysis (PCA). Zebu cattle showed the lowest genetic diversity (He = 0.240). Breeds with the highest genetic diversity level were HDV and BON (He = 0.350 and 0.340, respectively). Inbreeding was lower for Colombian cattle breeds ranging between 0.005 and 0.045. Overall, the largest average genetic distance was found among the group of Colombian cattle breeds and Zebu, while the smallest was found between ROM and CCC. Model-based clustering revealed some level of admixture among HDV and CAS cattle which is consistent with their recent history. The results of the present study provide a useful insight on the genetic structure of Colombian cattle breeds.
分析本土牛的遗传多样性对于实施保护计划、促进其可持续利用以及保持这些品种在当地条件下所具有的生产优势至关重要。本研究旨在调查哥伦比亚六个本土牛品种的遗传多样性和群体结构：Blanco Orejinegro（BON）、Costeño con Cuernos（CCC）、Romosinuano（ROM）、Sanmartinero（SAM）、Casanareño（CAS）和Hartón del Valle（HDV）。还包括两个额外的品种群体进行比较：Zebu（CEB）和哥伦比亚本土牛品种×Zebu 的杂交品种。使用期望杂合度（He）、近交系数（f）和纯合度运行（ROH）分析品种内的遗传多样性。使用基于模型的聚类（ADMIXTURE）和主成分分析（PCA）评估群体结构。Zebu 牛的遗传多样性最低（He = 0.240）。遗传多样性水平最高的品种是 HDV 和 BON（He = 0.350 和 0.340）。哥伦比亚本土牛品种的近交程度较低，范围在 0.005 到 0.045 之间。总体而言，在哥伦比亚本土牛品种和 Zebu 之间发现的平均遗传距离最大，而在 ROM 和 CCC 之间发现的最小。基于模型的聚类表明，HDV 和 CAS 牛之间存在一定程度的混合，这与它们的近期历史相符。本研究的结果提供了对哥伦比亚本土牛品种遗传结构的有用见解。
