DISCUSSION
The investigated chicken flocks showed generalized
weakness, depression, droopy appearance, pale comb
and wattles, stunting, growth retardation, and high
mortalities. The packed cell volumes measured were
markedly reduced (average PCV was between 17%
and 22%). Necropsy findings of the sampled chickens
revealed watery blood, yellow fatty bone marrow,
markedly atrophied thymus glands, atrophied bursa of
Fabricius, and enlarged livers and spleens. The
clinical signs, postmortem lesions, and PCV values
agreed with the findings of (Yuasa et al., 1979,
Taniguchi et al., 1982 & 1983, Aly 2001) and (Pope
1991, Ramadan et al., 1998) who stated that a case of
hematocrit value below 27% with yellowish changes
in bone marrow and thymic atrophy…