Naik, B.C. et al. 2005. The Immunomodulatory Role of Calf Thymus Extract on Humoral and Cell Mediated Immune Response in Chicken Vaccinated Against New Castle Disease Virus. International Journal of Poultry Science. 4, 8 (Jul. 2005), 580–583. DOI:https://doi.org/10.3923/ijps.2005.580.583.