Martínez R A, García D, Gallego J L, Onofre G, Pérez J, Cañón J
Animal Genetic Resource Group, Research Center Tibaitatá, Km. 14 Road to Mosquera Cundinamarca, Colombia.
J Anim Sci. 2008 Mar;86(3):545-52. doi: 10.2527/jas.2007-0175. Epub 2007 Dec 11.
The genetic structure of 4 Colombian Creole cattle breeds, namely, Costeño con Cuernos, Blanco Orejinegro (BON), Romosinuano (ROMO), and Sanmartinero (SM), was studied with an analysis of the available pedigree data. The comparison between the effective number of founders (f(e)) and the effective number of ancestors (f(a)) revealed a decrease in the genetic variation that was rather important for the ROMO and San Martinero breeds, which had the lowest f(a)/f(e) ratios (0.34 and 0.53, respectively). All breeds showed similar values for the number of equivalent generations traced, ranging from 3.1 in BON to 4.8 in ROMO. These 2 populations also had the lowest and the highest population sizes, respectively. The lowest average inbreeding coefficient considering the whole pedigree was obtained by BON (0.18%), whereas the highest was attained by ROMO (1.22%). Finally, the percentage of individuals with an inbreeding level greater than 6.25% in the reference population was high, indicating that the existing conservation management strategies could be improved to successfully maintain the genetic variability of these populations.
通过对现有系谱数据进行分析，研究了4个哥伦比亚克里奥尔牛品种的遗传结构，即科斯特尼奥角牛、白耳黑牛（BON）、罗马西努阿诺牛（ROMO）和圣马丁牛（SM）。对奠基者有效数量（f(e)）和祖先有效数量（f(a)）的比较表明，对于ROMO和圣马丁牛品种，遗传变异有所减少，这两个品种的f(a)/f(e)比率最低（分别为0.34和0.53）。所有品种追溯的等效世代数的值相似，范围从BON的3.1代到ROMO的4.8代。这两个群体的种群规模也分别是最低和最高的。考虑整个系谱，BON的平均近交系数最低（0.18%），而ROMO最高（1.22%）。最后，参考群体中近交水平大于6.25%的个体比例很高，这表明现有的保护管理策略可以改进，以成功维持这些群体的遗传变异性。
