The objective of this work was to assess how the cow pregnancy depends on the type of service as. race and follicular development in cattle with dual purpose in the Ecuadorian Amazon. The 341 records of the individual services were evaluated from January 2015 to December 2015 that corresponds to cows of different genotypes and cross: Brown Swiss (BS) n = 135. Charolais (Ch) n = 24. https://parisnaturalfoodes.shop/product-category/mass-tech-extrene-2000-vanilla/