الفهرس 
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Abstract
Tris study was carried out on 270different samples from 95ostrich bird with different ages in the four seasons for isolation and identification of certain moulds and yeasts of respiratory and digestive .The obtained results were isolation and identification of 138moulds isolates where A.flaves, A.fumigatus, A.niger, A.terreus, A.ocharceous followed by penicillium spp., Mucor spp., Rhizopus spp., Exophalia spp., Fusarium spp., Paecilomycesspp., Phialophoraspp., Helminthusporium spp, Aureobasidium spp., Chrysosporium spp.And isolation and identification of 100 yeast isolates where C.albicans was the most prevalent followed by C. tropicalis, Rhodotorula spp., C.pseudotropicalis C.glabrata, Geotrichum spp, C.guilliremondii, Cryptococcus albidus Cryptococcus lauranrii.Mould isolates were prevalent in autumn season than other season while yeast isolates were mor prevalent in summer season than other seasone. Also moulds and yeasts were more prevalent in ostrich chicks than juvenile and adult ostriches.