In the pregnant bovine female, the feto-placental complex synthesizes and secretes a wide range of hormones and glycoproteins, whose early expression during gestation in body fluids can be valued as a confirmatory method of pregnancy, so that in recent years These molecules have been isolated and characterized, emerging as another alternative to facilitate the reliable diagnosis of early pregnancy, through the use of biochemical techniques in the field and at the clinical laboratory level (Lee, 2015).