Abstract: This study selected Saihan district and Helingeer County in Hohhot dairy cattles are more in which to evaluate the pollution of risk factor in feedstuff and milk in scale raising farms and cow areas, and the research investigated veterinary drugs species in dairy cattle feeding. Evaluated risk factors in feedstuff were aflatoxin B₁ and heavy metal plumbum, evaluated risk factors in milk were aflatoxin M₁, heavy metal plumbum, colony count, somatic cell count and total antibiotics. The results showed that: ①The penicillin was used mostly in antibiotics, and veterinary drugs were used more in scale raising farms than in cow areas.②The detection rates for the two kinds of risk factors were 100% in feedstuff and did not exceed the standard.③Besides somatic cell, other risk factors in milk did not exceed the standard.④The other risk factors in cow areas were higher than in scale raising farms in addition to heavy metal plumbum.⑤Although the sample sizes were small,the investigation sites were selected at random, so the results to the investigation were helpful to guide the next risk assessment in milk.

Key words: Hohhot; milk; feedstuff; risk factors; investigation report