Which vaccination is usually given to pullet chicks grown for egg production to prevent a disease caused by a herpes virus?

The Marek's vaccination is specifically designed to protect pullet chicks against Marek's disease, which is caused by a herpes virus. Marek's disease is a lymphoproliferative disease that can lead to tumors and immunosuppression in chickens. The herpes virus responsible for this condition can contribute significantly to losses in chicken production, particularly in layers and breeders.

Vaccination against Marek's disease is a standard practice in poultry management to help ensure flock health and productivity. Marek's vaccines stimulate an immune response that helps protect birds as they grow and mature, particularly important as young pullets begin their development towards egg production.

In contrast, the other vaccinations listed target different diseases: Newcastle is aimed at preventing Newcastle disease, a viral infection that affects the respiratory, nervous, and digestive systems; infectious bronchitis vaccination protects against a disease affecting the respiratory tract; and Fowl Pox vaccination is for a viral disease characterized by skin lesions and respiratory issues. Each of these diseases is important but does not specifically target the herpes virus responsible for Marek's disease.