الفهرس 
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Abstract
A total number of 1060 and 444 QMS of subclinical, clinical mastitis and normal control k samples was collected from cows and buffaloes, respectively. The percentages of subclinical titis were 95% and 6l.2%, while those of clinical mastitis were 9.4% and 4.5%, respectively. relationship between the see and the host physiological conditions including the age and the of lactation was studied. Regarding the influence of infectious agents associated with mastitis aureus was the most prevalent isolated species followed by eNS, E. coli and S. agalactiae. A dy of the immunological role during mastitis with special reference to lysozyme, nitric oxide and catalase enzyme was done. The results revealed that the concentrations of lysozyme, NO catalase enzyme were significantly higher (P < 0.05) in clinically mastitic samples than in linically mastitic and normal ones. Their concentrations also recorded a significant increase (P >,05) with the increase of somatic cel count. The investigation revealed that the concentration of
,zyme reported a significant (P < 0.05) in milk samples affected with E. coli. A significant’ease in milk NO concentration (P < 0.05) was reported in milk samples infected with s. aureus. the mammary glands infected with eNS produced significantly higher levels of catalase than mammary glands infected with other organisms. The study clarified the protein
les of the whey of normal milk samples were separated according to their molecular weights wt) into (9-10) fractions. The same fractions were identified in mastitic milk samples, but different concentrations. Both percentages of a-lactalbumin and ~-lactoglobulin were markedly ’ered in mastitic milk whey samples, but the percentages of both BSA and lactoferrin were sed.