The effect of infectious coryza disease on the red blood cell count, packed cell volume, mean corpuscular volume, mean corpuscular haemoglobin concentration, mean corpuscular haemoglobin, erythrocyte osmotic fragility and body weight in 8 weeks old White England turkeys were determined. The erythrocyte osmotic fragility was significantly higher but the haemoglobin concentration and body weight were significantly lower in infected turkeys than in the healthy turkeys. The two groups of turkey however had similar red blood cell count, packed cell volume, mean corpuscular haemoglobin, mean corpuscular haemoglobin concentration and mean corpuscular volume.
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