الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
The work was carried out on adult healthy chickens , ducks and pigeons of both sexes.
Twelve birds from each species were used for morphological studies and three for histological preparations The birds were anaesthetized with chloroform inhalation, bleed through the common carotid artery and fixed with 10 formalin.