© Instituto de Investigación de Ciencias Biológicas UNMSM. The seasonal incidence of gastric habronemiosis was estimated in three center of breeding equine by the identification of third stage larvae. Fifty animals were studied and the results showed 92% of incidence of habronemiosis. Microscopically the general characteristic of the larvae and their magnitudes let the identification like to Habronema muscae (Carter, 1861). In all cases, we found to Musca domestica as responsability to spread this parasitism in the equines. We did not found significative relations between the age and the grade of parasitism, because the infection in young and adults animals were similar, and between the wounds on the skin with the gastric habronemiosis.