SINGH, GURKIRPAL. Determination of antibody levels in egg-yolks from laying hens vaccinated against Newcastle disease. The Indian Journal of Animal Sciences, Delhi, India, v. 65, n. 4, 2013. Disponível em: https://epubs.icar.org.in/index.php/IJAnS/article/view/31646. Acesso em: 24 oct. 2025.