الفهرس 
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Abstract
Results revealed that 312 out of 452 examined native breed sheep
of both sexs were infested with different species of GIN at incidence of
69.03%.243 out of 452 examined sheep appearntly healthy and 209 had
different clinical signs as gradual loss of condition, decreased appetite,
diarrhea, emaciation, anemia and submandebular edema, no deaths were
recorded within infested sheep during survey.
By Parasitological examination done on all the examined sheep
(452), 209 sheep about 202 representing 96.6% were infested with GIN,
while in 243 appearantly healthy sheep, about 110 were positive for GIN
representing 45.3%.
Regarding seasonal variation, the highest rate of infestation was
recorded in autumn (73.9%) and winter (72.7%), followed by spring
(68.9%) and the lowest infestation rate was in summer (58.3%).
By studying relationship between age and infestation rate with
GIN, results showed that lambs were the most susceptible (85.11%)
followed by yearling (69.2%) then adult sheep (43.3%).
Results of fecal egg count showed that mild (100-500 EPG),
moderate (500-2000 EPG) and high (over 2000 EPG) rate of infestation
were recorded in 34.9%, 33.9%, 31.09% of the total number of infested
sheep. By observing the treated animals, there were disappearance of most
clinical signs as diarrhea, anemia and obvious improvement in health
condition.
The efficacy % of anthelinjntics was calculated according to the
following formula:
Efficacy%= Mean EPG before treatment — mean EPG after treatment xlOO
Mean EPG before treatment Group 1: With mean of 1630 EPG before treatment with (Zanide) which
showed 100% efficacy at the 4th day (i.e. no eggs were
detected by fecal examination).
Group II: With mean of 760 EPG were treated with (parabenzole) and
gave 100% at 5th day after treatment.
Group III: had 700 EPG and reached to 100% efficacy at 3~ day of
treatment with (Genesis).
Regarding the effect of treatment on haematological picture, before
treatment there was significant decrease in Hb gm % and PCV%.
RBCs count showed highly significant decrease. While WBCs
count was highly significant increased compared to control non infested
group. Also highly significant increase in eosinophil %, neutrophils %
while lymphocyte % highly significant decreased.
By treatment all these parameters were improved toward normal
level (as control non infested sheep).
Conclusion
(1) Parasitic gastroentritjs is considered one of the most prevalent
diseases in sheep.
(2) High rate of infestation was recorded in autumn and winter. So,
we must begin anthelmintjc treatment at the beginning of these
seasons.
(3) Lambs were highly susceptible than adults, therefore they must be
separated from adults as infested sheep are considered the main
source of infestation.
(4) from experimental work, it was obvious that Genesis was superior
in clearance rate followed by Zanide and finally followed by
Paraljenzole.