الفهرس 
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Abstract
This study was carried on 80 native c ow calves in a large farm belonging to Cooperative Comittee for
Animal Producetion, Abu Hammad in Sharkia Province.
These animals were classified, according to the clin- ical symptoms, into 4 groups, each of them contained20 calves as follow:- First groups:
Were apparently clinically normal calves kept as control. Second group: Exhibited respiratory d.isorders. Third group: Represented by calves suffering from sporadic diarrhea.
Fourth group:
Were calves that exhibited skin lesion that proovedto be ringworm. Blood samples wer~ collected from clin-
ically normal and diseased calveg to evaluate the level of serum GUT, S. GPT, LDH, alkaline and acid phosphata- bses, cholinesterase (in plasma & RBCs) , amylase and lipase; The study of the biochemical analysi$ showed the following points:-