VERGARA G, Oscar et al. ESTIMATION OF HERITABILITY OF CALVING INTERVAL IN CROSSBRED CATTLE. Rev. MVZ Cordoba [online]. 2008, vol. 13, n. 1, pp. 1192-1196. ISSN 0122-0268. Objetive. To estimate the heritability of interval calving in crossbred cattle. Materials and methods. Information from database of La Leyenda farm, in the municipality of Caucasia (Antioquia) was used. A single-trait animal model was used, that included genetic group, year of birth, season of birth and the number of calvings as fixed effects and the