The BB index assists on assessing flock health

In the first part of this article on the bursa of Fabricius, (BF) in the previous edition of WP (27-10), the lack of standard of its size and the variety of influencing factors were addressed. Yet, the appearance of the BF is a helpful tool in assessing flock health and determining vaccination. But it should be used in combination with other observations and analyses. This can be expressed in the BB index. By Dr Christophe Cazaban and Dr Yannick Gardin, CEVA Sante Animale, France The first part