To investigate the effect of season and type of livestock on Aflatoxin M1 content and raw milk quality

The quality of raw milk plays an important role in the quality of the dairy products. The current study was aimed to investigate the quality of raw milk. Six hundred samples were collected from 5 industrial farms and 5 milk collection centers in Khorramabad city during the summer and winter (300 samples in each season). The amount of aflatoxin M1 was measured by high performance liquid chromatography (HPLC) in 40 samples (4 samples from each livestock). All of the 600 samples were investigated in terms of acidity, density, protein, water percent, protein, fat and total bacteria count. The results showed that in 5 samples out of the 40 (12.5%), the aflatoxin M1 was higher than the permitted level in national standard (50 ng / ml). The amount of fat, protein and density of samples collected in the winter was higher than those collected in the summer (P