Detection and assessment of sublethal infections of Eimeria tenella and Eimeria necatrix

1. 1. The estimation of the packed red-cell volume by the micro-hematocrit technique proved to be a convenient method of measuring anemia in chickens infected with E. tenella or E. necatrix . 2. 2. Hematocrit measurements were more sensitive to the effects of infection with E. tenella than observations on the growth rate. 3. 3. With E. necatrix , a marked retardation of growth occurred in birds in which only a mild anemia was detectable.