En el estudio se estimaron los niveles y las tendencias de la consanguinidad en variables de comportamiento durante la tienta y la lidia en dos ganaderías colombianas de reses bravas: Ernesto González Caicedo (EGC) – Popayán, Cauca, encaste Santacoloma; y Guachicono (GUA) - Bolívar, Cauca, Colombia, encaste Parladé. Se analizaron los pedigríes de 2.094 animales EGC nacidos entre 1918 y 2007 y 963 GUA, nacidos entre 1928 y 2005. Los coeficientes de consanguinidad de los bovinos se obtuvieron usando el Proc Inbreed del programa SAS v. 9.1.3. Se estudiaron además de las notas del ganadero, las variables propias y comunes a las faenas de tienta y de lidia. Los promedios y las desviaciones estándar de la consanguinidad en EGC y GUA fueron 4.9±6.6 y 4.2±4.2% para todos los animales, 4.5±5.8 y 6.0±3.4% para la última época estudiada, y 10.6±5.8 y 6.5±3.5% considerando sólo los consanguíneos. Se encontraron efectos positivos en las variables responsables de ‘toreabilidad’ y estilo, y depresivos en la fuerza de los animales. La consanguinidad actual en ambas ganaderías es mediana, sin embargo debe diseñarse un plan de apareamiento.//Abstract: This study was carried out to estimate levels and trends of the inbreeding on behavior variables during the tempt and fight from two fighting farms: Ernesto González Caicedo (EGC) and Guachicono (GUA) with strains Santacoloma, and Parladé respectively, located on Popayán and Bolívar, municipalities of the Cauca Department, Colombia. The pedigrees of 2094 EGC animals born between 1918 and 2007, and 963 GUA animals born between 1928 and 2005 were analyzed. Inbreeding coefficients of the cattle were obtained using PROC INBREED from the software SAS v. 9.1.3. In addition to the breeder’s notes the own variables, dealing and common to the tempt and fight task were studied. The average and standard deviations of the blood relationship during the total and the last time studied for the cattle raising EGC and GUA were 6.6 and 5.8%; and 4.2 and 6%, respectively. Means and standard deviations of inbreeding in EGC and GUA were 4.9±6.6 and 4.2±4.2% for the all animals, 4.5±5.8 and 6.0±3.4% for the last time studied , and 10.6±5.8 and 6.51±3.5% taking in to account only those that were related. The effect of some variables with the inbreeding had positive effects in those responsible for the ‘toreabilidad’ and style, and depressive on the force of the animals. The current inbreeding in these populations is medium; however, mating should be planned for an appropriate handling and to reduce increases in inbreeding.