Broilers are routinely vaccinated against only three viral diseases: Marek's disease, Ranikhet (Newcastle Disease), and Gumboro (Infectious Bursal Disease — IBD).
About Each Disease
Marek's disease: Caused by a herpesvirus; causes tumours of nerves and organs (lymphoma); vaccine (HVT — Herpesvirus of Turkey) given at day-old chick.
Ranikhet (Newcastle Disease): Highly contagious; caused by Avian paramyxovirus type-1; causes respiratory, nervous, and digestive signs; F1 strain vaccine used.
Gumboro (IBD): Caused by a birnavirus; destroys the Bursa of Fabricius causing immunosuppression; the bursa is the B-lymphocyte maturation organ in birds.
Note on Fowl Pox
Fowl pox vaccination is done in layers, not routinely in broilers (because broilers have a short production life of only 6 weeks, and pox takes longer to be a significant risk).
📚 About this Topic — Animal Refresher
This multiple choice question is from Animal Refresher, Poultry Science. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Refresher to strengthen your preparation.
