Field test studies of the 2512 strain of infectious bursal disease

Responses to an infectious bursal disease vaccine made from the 2512 strain were studied in broiler flocks under field conditions and management. Pre- and post-vaccination sera were analyzed by agar-gel-precipitin tests and beta virus neutralization. Specific measurements of broiler performance (livability, weight, feed conversion, and condemnations) were also analyzed. When possible, contemporary licensed products were compared at the same time in adjacent houses. Results of these trials indicate that the vaccine made from the 2512 strain of infectious bursal disease was highly immunogenic and safe under field conditions.