RESUMO
Contagious and environmental bacteria are current causes of mastitis and Bulk Tank Bacteria Count [BTBC]. Beside other hygienic procedures related to controlling mastitis, Post-Milking Teat Dipping [PMTD] with a suitable teat antisepsis has a special place and can play an important role in the kind of herd mastitis and decreasing the Total Bacteria Count [TBC]. This study was performed to evaluate the efficiency of short-time changing of PMTD solution on count and kind of milk tank bacteria. This study was conducted in 2 large dairy farms that their current antisepsis was iodophor components in 4 periods around Tehran during March to August 2010. In each 4 periods after the last time that iodophor was used, milk transfer tank sample was collected and 3 tests include Bulk Tank Somatic Cell Count [BTSCC], milk quality tests and bacterial isolation were performed. Then, antisepsis was replaced with chlore components for at least 2 weeks. At the end, another milk tank sample was obtained and tests were done again. Sectional changing of iodophor with chlore components in all 4 periods, according to decreasing in TBC, Coliform count, preliminary incubation count, laboratory pasteurized count, Staphylococcus count and Streptococcus count caused increasing the quality of milk and decreasing the mastitis. Changing in post-milking teat dipping has positive effect on quality of raw milk