الفهرس 
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Abstract
A total of 370 quarter milk samples were collected and subjected to California Mastitis Test (CMT) for detection of subclinical mastitis where 81.35% of examined quarter milk samples reacted positively to CMT. Somatic Cell Count (SCC) was measured and the correlation between SCC and CMT was studied. S.aureus was the most common isolated bacteria (51.89%) followed by E.coli (48.38%) while S.agalactiae could be isolated from (7.57%). The mean of Lactate Dehydrogenase enzyme (LDH) activity was estimated and it was 40.52 1.34 U\L in negative CMT samples while it was 94.94 1.94 U\L ,181.77 4.73 U\L and 406.98 11.30 U\L in positive CMT samples score +, score ++ and score +++ respectively. The correlations between LDH activity and other screening tests as (SCC & CMT) and isolated bacteria were investigated.