Abstract
A pretrial will be held in a hatchery of a broiler breeder company of São Paulo State, where eggs will be inoculated in the 18° day with and without probiotic, using as diluent Marek vaccine and applied through Embrex brand injections. The weights of the chicks, hatchability and mortality will be evaluated at hatching. Furthermore, there will be carried the Biometrics of 15 birds per tr…