الفهرس 
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Abstract
Ectoparasites particularly order Acarina, mites and ticks are incriminated in delayed growth, reduced production of meat, wool and in transmission of some diseases in sheep flocks. The obtained results revealed the followings Experiment I : A. Occurrence of mange in sheep: Out of 260 sheep in the farm at Summer 28 sheep (10.7 %) were infested with Sarcoptic scabiei ovis. In Winter the number of sheep was 330 of which 47 (14.24%) were infested with Sarcoptic scabiei ovis. Most of the lesion were localized on the head, especially the nose (70.67%),ears (13.3 %), ears and nose together (8 %), followed by the back (6.67 %) and tail (1.3 %). B. Control of ~heep mange: The use of either diazinon as spray (2 milL) for two times, 14 days intervals, or two subcutaneous injection with ivermectin (200 uglKg.), 14 days apart eliminated completely Sarcop tic scabici ovis from the infested sheep within almost 30 days.
C. Effect of sheep mange on general health condition: The weight of the animals and the blood picture as a major parameters for
the general health condition were studied before and after treatment with diazinon and ivermectin on 10 infested sheep and 7 sheep as control for a period of 30 days. The result shows that regardless the type of treatment either with the diazinon or ivermectin, the treated animals with diazinon (gained 5.9 %), ivermectin (gained 7.95 %) than the control group which gained only (2.44 %) as
an average weight during the entire experiment. The results studied on the blood picture as another parameter for the general health condition of sheep were not significant. Experiment II: Role of ticks in transmitting Past inultocida: By subjecting rabbits to experimental infection with Past multocida, they were able to be infected and acted as reservoirs in transmitting the infection to ticks attached to them. Mean while these ticks acted as vectors in transmitting the
infection to rabbits proving the dangerous role played by Rhipicephalus sanguineus and Rhipicephalus turanicus, in acquiring the infection with Pasteurella multocida from animals and transmitting it to them.