The combination of attenuated Newcastle disease (ND) vaccine with rHVT-ND vaccine at 1 day old is more protective against ND virus challenge than when combined with inactivated ND vaccine., Rauw, Fabienne, Gardin Y, Palya V, van den Berg Thierry, and Lambrecht Bénédicte , Avian Pathol, 2014, Volume 43, Issue 1, p.26-36, (2014)