الفهرس 
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Abstract
This study was done during a period started from July (1992) to end of June (1993). Studies were carried out on 467 sheep of different ages and localities in Egypt. The infestation rate of
coccidiosis among sheep was 80.67 96. Incidence and prevalence of coccidiosis among sheep in relation to age and season in different localities in Egypt were studied. Young lambs were found to be more susceptible to Eimeria infestation than old animals. The percentage of infestation were 91.33 %, 85.63 %, 63.64 96 and 51.51 96 in lambs less than 6 months, in lambs over 6 to 9 months, animals over 9 to 12 months and animals over 12 months respectively. The infestation rate was 83.55 96 in upper Egypt while it was 77.78 % in lower Egypt. However, the infestation rate was 91.04 % in summer, 78.57 % in spring, 76.54 96 in autumn and 74.45 % in winter. Eleven species of Eimeria were demonstrated in this study. The rate of infestation among sheep with each species was
studied. E.parva, E.ninakohylakimovae, E.arloinai, and E.crandallis were the most prevalent species among sheep. Sporulation time of each species was performed. Results showed
that the oocysts need more time to sporulate at low environmental condition while at higher temperature the oocysts take short time but this higher temperature might have harmful action on survivability of spores. Mixed infestation with more than two species of Eimeria up to 9 species were seen in 96.97 % of examined animals. Total oocysts count were conducted in faecal samples and animals were classified according to the total oocyst count per gram of faeces into light, moderate and heavy infested animals. Relation of month, season and age to type of infestation were
studied. Studying the distribution of Eimeria oocyst in the contents of different parts of intestinal tract of 8 dead lambs, it showed that E.arloingi, E.PrVIclekil.is were present in jejunum contents while E.glarva, E.faurei, E.pallida, E.ovina, E.ahsata and Eimeria intricata were present in ileal contents.
Studies of some blood parameter, liver function, serum macro- and micro-elements of animals naturally infested with coccidiosis revealed increase of eosinophils, alanine aminotransferase and total bilirubin and decrease in total RBCs, haemoglobin content, PCV, Aspartate aminotransferase, serum alkaline phosphatase and serum iron. No changes were observed in the level of serum glucose, calcium, copper and manganese.
Trial of experimental infestation with two species of Eimeria were conducted on 3 month aged lamb. Treatment with amprolium and sulphadimidine sodium were performed. Results revealed that coccidiosis affects body gain of lambs. Eimeria ninakohvlakimovae was more pathogenic for lambs than E.arloingi in spite of animals were infested with the same dose. Amprolium
and sulphadimidine sodium were effective for treatment of sheep coccidiosis.