الفهرس 
ACKNOWLEDGEMENTSOnly 14 pages are availabe for public view
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Abstract
This thesis has been mainly focused on mastitis caused by Staphylococcus infectionsThe aim of the present study was to : (1) The prevalence of staphylococcal mastitis among subclinical and clinical cases of cattle in some farms in Egypt 2) Isolation and identification of Staphylococcus sppfrom subclinical and clinical cases of mastitis 3) Characterize innate immune response (Assayable changes in concentrations of Interleukin - 6 (IL - 6) , lysozyme and nitric oxide (NO) concentrations in milk) during clinical and subclinical stages of bovine mastitis 4) The susceptibility of Staphylococcus aureus for its in - vitro sensitivity to antibiotics 5) Detection of methicillin resistant gene of the isolated Saureus strains by PCR A total number of 196 machine milked cows from different dairy farms were examined in this studyThe examined cows were classified into 2 groups as follows : A - Apparently normal cows (n=138) detected by palpation of udder and were subjected to CMT to detect subclinical mastitis B - Clinically mastitic cows (n=58) which had clinical signs of abnormal secretions of mammary glands containing clots or flakes , with udders showing swelling , hardness and systemic disturbances A total of 784 individual quarter milk samples were collected aseptically from 196 examined cows552 quarter milk samples were collected from 138 cows with apparently normal healthy udders and normal milk secretions while the remaining 232 quarter milk samples were from 58 cows linically mastitic.