La investigacion se realizo en las veredas Panamal y Maramba del municipio de Sapuyes (Narino) con el objeto de establecer la correlacion del recuento de bradozoitos de Sarcocystis sp. con la evaluacion del leucograma y la actividad enzimatica serica de creatinin quinasa (CK) y aspartatoaminotransferasa (AST). Se tomaron biopsias del musculo dorsal ancho y muestras de sangre en tubos de ensayo con y sin anticoagulante a 18 animales en el mes de junio de 2011. Para el recuento de bradozoitos se sometio las muestras musculares a digestion artificial con tripsina pancreatica porcina al 1,0%. Las muestras de sangre se procesaron para el recuento total y diferencial de globulos blancos y para la cuantificacion de la actividad enzimatica serica de CK y AST. Se determino una prevalencia del 100% para sarcocystosis quistica. El 75% de las muestras mostro incremento de AST, el 7% incremento de CK, el 14% incremento concomitante de CK y AST, indicando lesion muscular y/o hepatica reciente, compatible con las lesiones que causa el sarcocystis en el tejido muscular cuando se enquista entre sus fibras y en el higado en la fase proliferativa. 11% de los animales presento eosinofilia asociandose a miositiseosinofilica, lesion descrita en sarcocystosis quisticas. El 22% presento linfocitosis absoluta, compatible con actividad de sarcocystina (toxina del sarcocystis) en sangre, la cual se produce y libera en los quistes del parasito. La cantidad de bradozoitos de Sarcocystis sp por animal encontrada fue directamente proporcional a la edad de los mismos, siendo coherente con que, a mas edad del bovino, mas reinfecciones ha sufrido. En el estudio se aplicaron las pruebas: Pearson para los datos con normalidad y Spearman para los datos sin normalidad; con las dos pruebas, el P-valor estuvo por encima de 0.05, por lo tanto, no se encontro correlacion estadistica significativa entre los pares de variables evaluadas. Palabras clave: aspartatoaminotransferasa, bovino, bradozoito, creatinin quinasa, leucograma, Sarcocystis . ABSTRACT This research was conducted in the towns of Panamal and Maramba, county of Sapuyes, Narino, Colombia with the purpose of establishing the correlation between the count of Sarcocystis sp . bradozoitos and the evaluation of the leukogram and the serum enzymatic activity of creatinequinasa (CK) and aspartate aminotransferase (AST). Biopsies from the wide dorsal muscle and blood samples in test tubes with and without anticoagulant were taken to 18 animals in June, 2011. For the count of bradozoitos, the muscular samples were submitted to artificial digestion with porcine pancreatic trypsin to the 1.0%. The blood samples were processed for the total count and white blood cell differential and for the quantification of the serum enzymatic activity of CK and AST. A prevalence of the 100% for cystic sarcocystosis was determined. Seventy five (75)% of the samples showed an increase of AST, 7% of CK, and 14% concomitant increase of CK and AST. This shows recent muscular and/or hepatic injury compatible with lesions caused by sarcocystis in the muscle tissue, when it encysts into its fibers and it reproduces itself asexually in the liver. Eleven percent of the animal presented eosinophilia, this being associated to eosinophilicmiositis, an injury described in cystic sarcocystosis. Twenty two percent presented absolute linphocytosis compatible with activity of sarcocystine (toxin of sarcocystis) in blood, which is produced and released inside the parasites cysts. The amount of bradozoitos of Sarcocystis sp per animal was proportional to their age, being consistent with the amount of reinfections the animal can suffer over the years. In the study, the following tests were applied: Pearson for the data with normality, and Spearman for the data without normality; in these two tests, the P-value was over 0.05, therefore, there was not significant statistical correlation between the pairs of evaluated variables. Key words: aspartateaminotransferase, bovine, bradozoito, creatinnee quinasa, leukogram, Sarcocystis .