Investigation of some additive residues in bulk raw milk collected from Pakdasht area in 2009

Milk is one of the most important sources of human nutrition and because of high nutrientcontent; it is a very suitable medium for microbial growth and spoilage. Sometimes farmerscheat and add some additives to milk in order to cover the spoilage or other defects in milk. Inthis study 120 samples of bulk raw milk (10 samples each month) were collected from dairyfarms of Pakdasht under sterile condition and send to veterinary faculty of Garmsar University.The following tests were done on each sample: Anti-microbial residues, residues milk acidityneutralizer, evaluation of sugar, formalin, Hydrogen peroxide, Salicylic acid and salt presence.Results were analyzed with Spss software and the results of the first six months of the yearwere compared statistically with the results of the second six months of the year. The mean ofantimicrobial agents, milk acid neutralizer, formalin, hydrogen peroxide and salicylic acidshowed no significant difference. But sugar in first semester were more than second semester(p<0.05). Also, salt of all samples were determined in normal value.