[Aspects of the large divergence in the sialic acid level of the blood serum of poultry].

Scanning electron microscopy made it possible to establish that there were no echocytic forms of the erythrocytes in chickens in which the blood serum level of sialic acid was below 35 and over 60 mg%. The amount of the total protein and the individual protein fractions did not correlate with the level of sialic acid. On the other hand, the high level of sialic acid could be accompanied by both low and high blood sugar content.