THE QUANTITATION OF TRYPANOSOMA-CONGOLENSE IN CALVES .1. HEMATOLOGICAL-CHANGES

  • 1 January 1980
    • journal article
    • research article
    • Vol. 31  (2) , 215-231
Abstract
Anemia due to T. congolense infection in neonatal and 6 mo. old calves was hemolytic and moderately responsive. The red cells were macrocytic and normochromic in both groups of calves and the anemia was milder in infected neonatal calves compared to the 6 mo. old calves. The neonatal calves maintained normal white blood cell counts and developed a lymphocytosis at 2 wk of infection. The 6 mo. old calves developed mild neutropenic leukopenia at 1 wk post-infection without lymphocytosis. Plasma Fe turnover rates were not different between infected and control calves in either age group at the 2nd wk of infection, but both groups of infected calves had higher turnover rates at the 6th wk of infection. The mean percent of radioiron uptake into peripheral blood red cells was similar in the controls and infected calves, but the rate of appearance of labeled red cells in the peripheral blood was more rapid in the infected calves. Radioiron uptake was depressed in the infected 6 mo. old calves during 2nd wk of infection, but not in the 6th wk. Apparent plasma volumes were increased in both groups of calves at both time periods.

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