Many countries limit the concentration of AFB1 in dairy cow feed, but not that of total AFs. It is understandable and logical because AFM1 is the metabolite of AFB1, and limiting AFB1 in animal feeds is the most effectiveway to control AFM1 in milk. In the present study, the AFB1 contents in all the positive feed samples were lower than 10 mg/kg of the China legal limit, and even lower than the EU legal limit of 5 mg/kg. Furthermore, the total contents of AFs in all the positive feed samples were below the U.S. legal limit of 20 mg/kg (FAO, 2004). The contamination by AFB1 in the dairy cow feed, where the incidence was 42% and the levels ranged from 0.05 to 3.53 mg/kg, was lower than that reported in a previous study by Ao and Chen. They detected AFB1 in the range of 3.1e9.2 mg/kg in all eight dairy cow feed samples. Meanwhile, the AFM1 was detected in the raw milk in the present study, with the incidence of 22.5% and the contents ranging from 5.2 ng/L to 59.6 ng/L, which were also lower than that reported by Pei, Zhang, Eremin, and Lee (2009). They measured the AFM1 contamination in 12 raw milk samples collected from markets in the northeast of China. AFM1was detected in all the samples in the range of 160e500 ng/L.