Abstract
The induction of Hb A (alpha 2 beta A2) and Hb C (alpha 2 beta C2) synthesis in three adult sheep has been sequentially analysed, in relation to the reduction of the haematocrit (Ht) and to the changes of erythropoietin (Epo) concentration in plasma. Hb A production is detected in peripheral reticulocytes when the Ht approaches 70% of its initial value in correspondence with the first rise of EPO plasma level, whereas HB C synthesis appears when the Ht is further reduced to about 50%, at an Epo concentration two to three times higher. The assumption that the cell committed to HB C synthesis is close to the erythroid colony-forming unit (CFU-e) progenitor is also discussed.
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