The aim of the present paper was to evaluate genetic diversity within and among Ecuadorian bovine breeds using microsatellite markers. The genetic identity and the exotic influences from taurine or zebuine cosmopolitan breeds on Macabea, Loja, Santa Elena, Manabí and Isla de Puná breeds were evaluated. Twenty-eight microsatellite markers were tested across 254 individuals belonging to the five Ecuadorian populations to investigate intra and inter population genetic diversity levels. Nineteen markers in common with a set of 1595 samples of 35 previously typed breeds were used to determine the potential origin of Ecuadorian bovine breeds and to identify and quantify their genetic relationships. The findings of F_IS > F_ST (0.0814 > 0.0499), even in the context of low but significant F_ST values, may be indicative of the intrapopulation origin of the variability of allelic frequencies across populations. Conclusively, the study of genetic distances and population structure suggested the origin of Ecuadorian populations may likely stem from Southern Spanish breeds, with no significant recent influence from cosmopolitan Taurine or Zebuine breeds. These findings may provide a solid basis for the demonstration of an Ecuadorian breeds identity in the framework of the genetic conservation of the American creole populations.

本文的目的是使用微卫星标记评估厄瓜多尔牛品种内部和之间的遗传多样性。评估了牛磺酸或zebuine大都会品种对Macabea，Loja，Santa Elena，Manabí和Isla dePuná品种的遗传特性和外来影响。在属于五个厄瓜多尔人口的254个个体中测试了28个微卫星标记，以调查种群内和种群间遗传多样性水平。19个标记与35个先前输入的品种的1595个样本的集合共同使用，用于确定厄瓜多尔牛品种的潜在来源，并鉴定和量化它们的遗传关系。的调查结果˚F _IS  >  ˚F _ST（0.0814> 0.0499），即使在较低但显着的F _ST值的情况下，也可能表明人群中等位基因频率变异的种群内起源。结论是，对遗传距离和种群结构的研究表明，厄瓜多尔种群的起源可能源自西班牙南部的品种，近期国际化的牛磺酸或Zebuine品种没有重大影响。这些发现可能为在美国克里奥尔人的遗传保护框架内证明厄瓜多尔品种身份提供坚实的基础。