الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
The importance of cryptosporidial infection in poultry lies ird’s important body systems (respiratn its pathological effect on the biory system, digestive system, urinary system in addition to its effect on the bursa of fabricius), so this study was done to detect the prevalence of cryptosporidial infection among domesticated chickens suffering from respiratory or digestive problems or both in Assiut governorate, and studying its pathologic effect on chickens when inoculated to the bird by different routes (intracrop and intratracheal routes) in addition to comparison between the effect of some medicinal compounds (curcumin watery extract and spiramycin) on the infection with it, this study included;
Collecting 120 diseased chickens; divided into 89 broilers and 31 balady chickens ranged from 1-13 weeks old from different localities in Assiut governorate; and were examined by microscopical examination of MKAF stained films for the incidence of infection. The recorded data revealed that the incidence of Cryptosporidium was 58.3% with 64.5% in broilers and 56.2% in balady. The infection was more frequent at Autumn season 74.2% followed by Winter 62.9% then Spring 59.1% and Summer 37.5%.
from another view, it was found that the incidence rate of the parasite in the respiratory system was 29.4% in the trachea including nasal cavity and sinuses while was 17.5% in the lung with air sacs. The incidence in the gastrointestinal tract was 6.3% in the proventriculus; 12.6% in the duodenum; 28.6% in jejunum; 41.2% in ileum; 13% in caecum and 40.5% in rectum with cloaca. The incidence in kidney was 18.4% and it was 42% in the bursa of fabricius.
Experimental studying to the effect of the different inoculation routes revealed different parasitized sites where the intracrop route concentrated the infection in the kidney, rectum, cloaca and bursa of fabricius, while the intratracheal inoculation route spread the infection to the respiratory system beside the large intestine and the bursa of fabricius.
The curcumin watery extract at concentration of 750mg/kg b. w. produced 56.3% efficiency against the oocysts shedding that is nearly equivalent statistically to spiramycin efficiency (48%) and a bursa lesion score (0) contrary to (1) in case of spiramycin.