الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The Present Study was designed to investigate the prevelance of Subclinical mastitis . A total number of One hundred and sixity (160) cow’s quarter milk samples were collected from different dairy farms at Sharkia – Governorate for detection the causative agents of Subclinical mastitis , the results revealed that California mastitis test was graded as (- , ± , + , ++ , +++ ) with incidence of ( 12.5 , 6.25 , 34.375 , 25.526 , and 21.25 % ) respectively ,the mean ± SEM of milk electrical conductivity ( ms / cm ) , Somatic cell count ( cells / ml ) , Chloride % , Fat % , Protein % , Lactose % ,and SNF %with incidence of ( 6.5 ± 2.5 , 547.5 × 103 ± 507.5 × 103 , 0.235 ± 0.165 , 2.65 ± 1.15 , 3.1 ± 1.1 , 3.55 ± 1.45 , and 7.5 ± 1.5) ,The most predominant single pathogens in 100 Out of 160 milk samples was ( S . aureus , S.agalactiae , S.dysagalactiae , S.uberis and E.coli ) with incidence of (21.875 , 15.625 , 12.5 , 6.25 and 6.25 % ) respectively , and normal healthy control 20 ( 12.5 % ) milk samples ( didn’t yield any pathogens ) , and 40 ( 25 % ) milk samples yield mixed bacterial pathogens . It can be concluded that California mastitis test was used to determine the severity of Suclinical mastitis . California mastitis test positive and Somatic cell count ˃ 250.000 ( cells / ml ) in individual quarter foremilk samples was found to be accompanied by several production effects and sever depression in milk chemical parameters , Bacterial contamination of milk from affected cows render it unfit for human consumption , and there is correlation between Somatic cell count and decrease chemical milk parameters . CONCLUSION: California mastitis test was used to determine the severity of Suclinical mastitis . California mastitis test positive and Somatic cell count ˃ 250.000 ( cells / ml ) in individual quarter foremilk samples was found to be accompanied by several production effects and sever depression in milk chemical parameters , Bacterial contamination of milk from affected cows render it unfit for human consumption , and there is correlation between Somatic cell count and decrease chemical milk parameters