The hematological lesions
consequent upon velogenic Newcastle disease virus (NDV) infection were
investigated in 6-week-old ducks and chickens. Following intramuscular
inoculation, the results indicated significantly lower (p < 0.05) packed
cell volume (PCV) in infected chickens (IC) on days 3 - 9 post inoculation (PI)
and in infected ducks (ID) on days 3 - 15 PI. The hemoglobin concentrations
were significantly lower (p < 0.05) in IC on days 3, 6 and 15 PI while in
the ID, they were significantly lower (p < 0.05) on days 3, 9 and 15 PI. The
total erythrocyte counts were significantly lower (p < 0.05) in IC on days
3, 9 and 15 PI and in ID, they were significantly lower (p < 0.05) on days 3
and 9 PI. The mean corpuscular values indicated macrocytic hypochromic anemia
in IC and macrocytic normochromic anemia in ID. The leucogram showed leucopenia
in IC and initial leucopenia followed by leucocytosis in ID. The hematological
pictures of the velogenic NDV in this experiment indicate less susceptibility
of ducks when compared with the chickens. The severity of this virus infection
in chickens and the mild clinical signs and lesions presented by ducks showed
that ducks are far less susceptible than chickens.
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