الفهرس 
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Abstract
Eighty random samples of cow were collected from different farms at Sharkia Govemorate, Egypt in sterile bottles and transferred to the laboratory in ice-box to maintain its chemical and microbiological status unchangeable. Each sample was mixed
thoroughly before being divided into three parts. The first was
examined for incidence of mastitis, the second for chemical
examination, while the last one was used for bacteriological
examination.
The SCC/ml. was studied and reveal that normal samples
contained less than 2x 105 SCC/ml., while the mastitic ones
contained higher numbers of SCC exceeded 5 x l 06/ml. there was a
marked increase in SCC in cow udder affected with subclinical
mastitis than that in normal milk.
The results of CMT reveal that 30(37.5%) of the examined
cow milk samples were negative and 50(62.5%) were positive.
The results of WST reveal that 31(38.8%) of the examined
cow milk samples were negative and 49(61.3 %) were positive.
The chemical examination of chloride of normal and mastitis
cow milk samples reveal that the mean values of chlorides% were
(O.0980±0.00341 & 0.1546±0.00 170).
Statistical analysis of cow milk samples show presence of
great significant variation in the parameters between normal and
mastitis milk samples of mean value at (p<O.Ol) for chlorides% and
SCC/m!.