الفهرس 
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Abstract
In the present study 395 lactating cattle and buffalo cows from different farms located in Behera , Alexandria , kalupia and Assiute governorates were investigated for mastitisSamples which were taken from these animals (blood and milk) were collected for assessment of different types and causes of mastitis as well as estimation of the corresponding hematological , serum biochemical , hormonal and milk changesThe results of bacteriological examination of milk samples showed that 3910in hundredof cattle cows and 3408in hundred of buffalo cows were positiveThe bacteriological examination revealed that the most predominant microorganisms isolated from cattle cows were (Coagulase negative Staphylococci+Ecoli) (3170in hundred) followed by (Staphylococcus aureous+other strept) (2561in hundred) , (Staphylococcus aureous+Ecoli) (1829in hundred) , (Coagulase negative Staphylococci+other strept) (1342in hundred) , (Coagulase negative Staphylococci Streptococcus agalactiae) (732in hundred) and (Ecoli) as a single isolate (366in hundred) , while the main isolates in buffalo cows were (Staphylococcus aureous+other strept+Ecoli) (5000in hundred) , followed by (Coagulase negative staphylococci+other strept) (1724in hundred) , (Ecoli) (1379in hundred) , (Staphylococcus aureous) (1208in hundred).