الفهرس 
AbstractOnly 14 pages are availabe for public view
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Abstract
In this study, Examination of 1408 quarter milk samples resulted in detection of subclinical mastitis in 388 of the quarter milk samples with an incidence of 27.5%. Moreover, 86 quarter milk samples showed clinical mastitis with an incidence of 6.1%. there was positive correlation between SCC and CMT, S. aureus that was the most prevalent species isolated from examined cows (63.4%) and about 9.29 % of the examined milk samples showed no bacterial isolates.The mean titer of anti S. aureus specific IgA was high level in colostrum whey (1: 3072) than milk whey (1: 240) and serum (1: 35) in all samples. While, the mean levels of anti S. aureus specific IgG and anti S. aureus specific IgM were higher in colostrum whey (1: 3840, 1: 1408) compared to serum (1: 1920, 1: 1088) and milk whey samples (1: 448, 1: 104), respectively. There was higher mean titer of anti S. aureus specific IgA associated with S. aureus than CNS infected in milk but there was no significant difference. S. aureus associated with higher mean titer level of anti S. aureus specific IgM and IgG in milk than CNS. but there was non significant difference. The high mean titer of anti S. aureus specific IgA association with subclinical mastitic milk samples in comparison with clinical ones. The level of anti S. aureus specific IgA in sera has similar same titer in clinical and subclinical mastitic samples. There was a high mean titer of anti S. aureus specific IgM and IgG level associated with clinical mastitic milk and serum samples in comparison with subclinical ones. The progressively increased the level of anti S. aureus specific IgA, IgM and IgG in milk and serum samples with increase SCC. The value of IFN- γ was higher in whey than serum. While, there was very high concentration of IFN- γ in colostrum and there was very high significant difference between level in colostrum and milk than serum. Level of IFN-γ had high concentration associated with mastitic milk and serum samples with S. aureus in comparison with CNS. The level of IFN-γ had high concentration in clinical mastitic milk in comparison with subclinical ones. The progressively increased in level IFN-γ in milk and serum samples with SCC > 500,000 cells/ml was higher than in samples showing < 250,000 cells/ml. The present study recorded a positive correlation between anti S. aureus specific IgA and IFN-gamma. On the other hand, a negative correlation between anti S. aureus specific IgA and anti S. aureus specific IgM Finally , there was a negative correlation between anti S. aureus specific IgM and IFN-gamma.