Abstract
Maturing erythroblasts and erythrocytes were studied in chickens and adult hens to provide more information on the presence and frequency of various nucleolar types in these cells. Nucleoli were present at all stages of erythroblastic and erythrocytic development except in the case of a few reticulocytes and the mature erythrocytes. The number of nucleoli per cell (expressed as the nucleolar coefficient) reached a maximum at the stage of the polychromatic erythroblast. Early erythroblasts were characterized by the presence of compact nucleoli or nucleoli with nucleolonemata. Rings shaped nucleoli and micronucleoli increased in number with further maturation. Cells of the final erythroblast stage (orthochromatic erythroblasts) contained mostly micronucleoli, and micronucleoli alone were present in reticulocytes and mature erythrocytes.
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