Abstract
Four week-old broiler chicks were singly infected by oral administration of Eimeria acervulina, Eimeria necatrix, Eimeria brunetti, or Eimeria tenella oocysts. At intervals throughout the resulting infections, calcium absorption was determined by measurement of the amount of the oral dose of radiocalcium that appeared in the blood stream of the infected birds at intervals of 1, 4, and 8 hours post dosing. Calcium absorption was increased on the first day of all infections and was decreased on the sixth day of infections by E. acervulina, E. necatrix, and E. brunetti; but not by E. tenella. Thus, in contrast to zinc, oleic acid, protein, and certain amino acids, calcium appeared to be absorbed throughout the length of the small intestine.
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