3Stee A, Moehol J,Kurek L, et al. The influence of different factors on selenium levels in the centraleastem region of Poland[ J ]. Pol J Vet Sci ,2005, (8) :225 -229
4束生赓，邵金凤．青海省食物营养成分表．西宁：青海人民出版社，1994．2—18
5Wang YY,Sui KX,Li H,et al.The effects of lead the exposure on placental NF-kappa B expression and the consequences for gestation[J].Record Toxicol,2009,27(2):190-195.
6Llanos MN,Ronco AM.Fetal growth restriction is related to placental levels of cadmium,lead and arsenic but not with antioxidant activities[J].Record Toxicol,2009,27(1):88-92.
