Gallimune 407 ND+IB+EDS+ART Uses Booster immunization of breeder and layer pullets after vaccination with live vaccines against: - Newcastle Disease virus in order to reduce egg drop linked to Newcastle Disease infection, - Infectious Bronchitis virus in order to reduce egg drop linked to Infectious Bronchitis infection caused by the Mass41 strain, - Avian pneumovirus in order to reduce respiratory signs linked to avian pneumovirus infection (Avian Rhinotracheitis). Active immunization of breeder and layer pullets in order to reduce egg drop linked to infection with Egg Drop Syndrome virus (EDS76) without priming. Newcastle Disease, Infectious Bronchitis and Egg Drop Syndrome components: - Onset of immunity: 4 weeks after vaccination, - Duration of immunity: one laying period. Avian Rhinotracheitis component: - Immunity has been demonstrated by challenge 14 weeks after vaccination and persists until the end of the laying period.