Coccidiosis in a Chukar

Coccidiosis in a Chukar
History:   The flock is healthy in the brooder house, but 3-4 weeks after being turned out 2-5% of the birds get weak, thin, and listless.
Gross Lesions:  The two birds were in good body condition with no pectoral muscle atrophy.  No lesions of any significance were found.
Histopathology:
Small intestine:  There are abundant intracellular coccidia in [...]