New World's hair sheep breeds may genetically stem from West African introgression into established ecotypes of Spanish descent presumably extinct in the XIX Century. However, present Canary non-wooled breeds have presumably regressively resulted from the absorption of primitive individuals through Venezuelan descendants. We studied genetic diversity, structure, and evolution of the Canary hair sheep since its reintroduction in the 1950s. Demographic and genetic variability were evaluated using ENDOG (v4.8). Effective population size based on individual inbreeding rate was around one third higher than when based on individual coancestry rate. Nei's distances and equivalent subpopulations number indicated a highly-structured population. Although genetic diversity loss since the founder generations could be considered small, narrower pedigree bottlenecks could result from intraflock breeding policies and excessive contribution of few ancestors. Long generation intervals could be considered when reducing inbreeding. Wright's fixation statistics indicated slight interflock inbreeding. Pedigree completeness suggested genetic parameters were reliable, hence controlling inbreeding negative effects, could indeed, be crucial preserving these animal resources, consolidating the population in the archipelago after reintroduction.

新世界的毛羊品种可能源于西非的渗透，可能是十九世纪已经灭绝的西班牙血统的成熟生态型。但是，目前的金丝雀非垂死品种可能是通过委内瑞拉后裔吸收原始个体而退化的结果。自1950年代重新引入以来，我们研究了金丝雀毛羊的遗传多样性，结构和进化。使用ENDOG（v4.8）评估人口统计学和遗传变异性。基于个体近交率的有效种群规模比基于个体同卵异种率的有效种群规模高约三分之一。Nei的距离和等价的亚群数量表示一个高度结构化的种群。尽管可以将创始人几代以来的遗传多样性损失视为很小，群体内育种政策和少数祖先的过度贡献可能导致家谱瓶颈缩小。减少近交时可以考虑较长的世代间隔。赖特的注视统计数据表明有少量的近亲繁殖。谱系完整性表明遗传参数是可靠的，因此控制近交负面影响确实可能是保护这些动物资源，在重新引入后巩固群岛种群方面至关重要的。