Abstract
Summary
Plasma of high erythropoietic titer has been produced in cull breeder sheep by the use of phenylhydrazine. The potency of plasma appears to have an inverse logarithmic relationship to the final hematocrit levels of the sheep blood. By making adjustments of the phenylhydrazine dose according to the condition of the individual sheep, the potency of the plasma pools from 25-50 animals has been raised to an average of 1.3 u/ml. This value is about 130 times the potency of normal sheep plasma.
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