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.

Romosinuano 牛品种是哥伦比亚最重要的克里奥尔遗传资源之一，适应性或繁殖效率等有趣的特性促进了其在美洲不同国家的使用。为了巩固谱系历史记录，对该种群中最早的产量记录的审查被用来重建自第一批动物纳入体内种质库以来该品种的谱系，并估计不同的人口统计参数。完整的家谱包括 17,136 只动物，两条途径的世代间隔为 5.8 年。估计种群和近交动物的平均近交率分别为2.53%和6.32%，近交动物的数量在各代中逐渐增加。近 48% 的动物存在某种程度的近亲关系。根据所有世代回归估计的近交率，有效种群规模 (Ne) 为 120 只动物，而按等效世代估计的 Ne 为 69 只动物。有效创始人数量 (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 之间的关系为 64%，表明研究人群中存在遗传瓶颈效应。