Corporación Colombiana de Investigación Agropecuaria-Agrosavia, Centro de Investigación Motilonia, Km 5 Vía Becerril, Cesar, Agustín Codazzi, Colombia.
Corporación Colombiana de Investigación Agropecuaria-Agrosavia, Centro de Investigación Turipaná, Km 13 Vía Montería-Cereté, Córdoba, Colombia.
Trop Anim Health Prod. 2023 Aug 17;55(5):292. doi: 10.1007/s11250-023-03694-1.
The Romosinuano cattle breed is one of the most important Creole genetic resources in Colombia, and interesting traits like adaptation or reproductive efficiency have promoted its use in different countries in America. To consolidate the genealogical historical records, the review of very first yield records in this population was used to reconstruct the genealogy of the breed since the first animals incorporated to the in vivo germplasm bank and estimate different demographic parameters. The complete genealogy comprises 17,136 animals with 5.8 years of generation interval for two pathways. The estimated average inbreeding for the population and inbred animals was 2.53% and 6.32% respectively, with a progressive increase of inbred animals across the generations. Almost 48% of the total animals presented some level of consanguinity. Effective population size (Ne) based on the inbreeding rate estimated by regression in all generations was 120 animals whereas Ne estimated by equivalent generations was 69 animals. Effective number of founders (Fe), effective number of ancestors (Fa), and ancestors explaining 50% of variability were 75, 48, and 22, respectively. The relation between Fa/Fe of 64% indicates a genetic bottleneck effect in the population studied.
罗莫西努阿诺牛品种是哥伦比亚最重要的克里奥尔遗传资源之一，其适应能力和繁殖效率等有趣特征促进了它在美国不同国家的应用。为了巩固系谱历史记录，对该群体最早的产量记录进行了回顾，以重建自第一批动物被纳入活体种质库以来的品种系谱，并估计了不同的人口统计参数。完整的系谱包括 17136 头动物，两条途径的世代间隔为 5.8 年。估计该群体和近交动物的平均近交系数分别为 2.53%和 6.32%，近交动物在各世代中呈递增趋势。几乎 48%的动物存在某种程度的亲缘关系。基于所有世代中通过回归估计的近交率，有效种群大小（Ne）为 120 头，而通过等效世代估计的 Ne 为 69 头。有效创始者数量（Fe）、有效祖先数量（Fa）和解释 50%变异性的祖先数量分别为 75、48 和 22。Fa/Fe 的关系为 64%，表明研究群体存在遗传瓶颈效应。
