| investigation of a chronic feed-passage problem on a broiler farm in northwest arkansas. | a commercial broiler farm with a history of poor feed conversion and chronic feed-passage problems was chosen for investigation. chickens were taken from the broiler flock at specified intervals during growout and tested by virus isolation and enzyme-linked immunosorbent assay (elisa) for avian reovirus. abnormal tissue pathology was first seen in the broilers at 9 days of age and continued sporadically throughout the growout period. antireovirus antibody levels began to increase at 24 days of a ... | 1991 | 1649595 |