Gross Examination
A five-week-old, 148 g, female Buckeye chick is submitted for necropsy. This chick has a one-week history of being puffed up and anorectic with weight loss.
At necropsy, the body was in fair postmortem condition. The bird was emaciated, with marked, diffuse skeletal muscle atrophy. Esophagus and proventriculus were inverted into the ventriculus, with marked ectasia and mural thinning of ventriculus. The proventricular mucosa was edematous, with adherent yellow, fibrinous material. Moderate amounts of feed were trapped between proventriculus and ventriculus. Scant digesta was present in distal segments of intestine, and no feces were evident in cloaca. Other viscera were within normal limits.
Gross diagnoses:
1. Chronic intussusception of proventriculus
2. Emaciation
COMMENTS ON GROSS EXAMINATION:
This is a very rare condition in chicks, resulting from altered gut motility but generally of unknown cause. One old publication suggests an association with coccidiosis.
Limited microscopic examination of tissues will be performed to identify possible causes;
unfortunately, insufficient fecal material was present to look for coccidian parasites, but they may be visible on direct examination of the tissues.