الفهرس 
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Abstract
In this study, the livers of 1010 cattle, 277
buffaloes and 350 sheep were exRmined from certain
localitites in Behera Governorate from April 1981
until March 1982. Pasciola giantica was the only
species of Fasciola that was present. The prevalence
of infestation was 30.01% in cattle, 44.04% in buffa-.
bee and 4G.23% in sheep. The difference in the
prevalence was not only limited to the type of animal,
but it also differed according to sex variation of the
same species. The percentage of infestation among
female animals was relatively higher than that in males.
It was 35.c3c.% among male cat1e, while in females
it was o8.29,. Similarly, the percentage o± infested
male buffaloes was 38.38%, while in females it was
62.22%. The male buffalo calves’, which were slaughtered.
atthe ae of 40 days, were rarely infested, with
P. giantica. Regarding the seasonal prevalence, the
hhet variations among cattle, buffaloes and sheep
were noticed ducing the winter (rainy season) namely
44.65%, 53.62% and 55.95%respective1y. The lowest
prevalenceo±’ infestation was observed during the summer
(dry season) namely 33.22% in cattle, 35.8%2 in
buffaloes and 37.64% in sheep.
Concerning the percentage of liver condemnation
due to F. gigantica, it was noticed that the mean percentage
was l2.64/ among cattle and. buffaloes, respectively.
The highest percentage was observed in sheep
(32.50%). Regarding the effect of temperature on the
hatching of P. gigantica eggs, it was observed that
the optimum temperature for hatching the eggs was
30°C. Th results revealed that the egg counts,
taken four times a day, in the faeces of animals mdi—
cated a gradual increase from 6:00 A.M. until 12:00
P.M. followed by a gradual decrease after 4:00 P.M.
It was noted that Lymnaea cailliaudi and LymnaeacailLiauai
var. alexandrina were the only species of
.T-iymnaea snails which were present in .ehera Governora—
te. The ieroduction and. propagation of these snails
began at the end of summer and beginning of autumn
(September and October). A sharp increase in the number occured andieacheda peak during Decemberthrough Pebuaay (the rainy season). The mean number of the snails
strated to decrease from March to August. The lowest
number was observed during July and August (the dry
season). .Liytnnaea cailliaudi were mainly found at the
marginof the drainage channels, small irrigation
channels, wide irrigation channels and the margin of the nile river.