Abstract: Mastitis in livestock means transformation and pathogenesis in udder tissue which may affect one or all quarter of cattle and lead to non-usable of the milk. Although, mastitis may be seen in all livestock, it is of high economical importance in dairy cattles. The studies reveal that notwithstanding disease agent, mastitis is more prevalent in most countries. Coli form bacteria are opportunist. All environmental resource which are in contact with udder are considered as important for pathogenicity of organism. When udder gland is infected, Escherichia coli bacterium propagates at high numbers and produces a strong endotoxin resulting in edema and mastitis. About 1000 dairy cattles of traditional farms of Sarab and its surrounding villages were considered as understudy statistical population out of which 752 were lactating cattles. Preparing milk samples of these cattles according to the following stages, the samples were studied) measuring individual cell count of milk samples of understudycattles) conducting CMT (California Mastitis Test) for cows′ milk whose cell count in over than 150000 in mL) sterile sampling from milk of quarter whose CMT result were positive and transferring the samples to bacteriology laboratory) centrifuging milk and culture sample from deposit and cream resulted in the culture media) conducting of differential tests for colonies related to Enterobacteriaceae of positive suspected lactose in order to determine species and genus of the isolated bacteria) conducting of antibiogram test.
Mohammad Ali Dadkhah, Mahdi Yeganehzad and Behnaz Nadery, 2011. Prevalence of Mastitis Resulted from Bacteria of Enterobacteriaceae Group (Coli Forms) and Determining Their Antibiotic Sensitivity in Traditional Farms of Sarab City, Iran. Journal of Animal and Veterinary Advances, 10: 1269-1272.