Kouwenhoven B, Davelaar F G, Van Walsum J
Poultry Health Institute, Doom, The Netherlands.
Avian Pathol. 1978 Jan;7(1):183-7. doi: 10.1080/03079457808418269.
Proventriculitis, runting and poor feed conversion sometimes associated with rachitis, was seen in chickens on a large broiler farm. It was shown that the proventriculitis was caused by an infectious agent.