3Sakha M, Ameri M, Sharifi H? et al. Bovine subclini-cal ketosis in dairy herds in Iran[J], Vet Res Com-mun,2007,31(6) :673-679.
4Zhu X*Smith M A,Honda K,et al. Vascular oxidativestress in a lzheimer disease[J] . J Neurol Sci,2007,257( 1 /2):240-246.
5Zhang Z G,Li X B,Gao L,et al. An updated methodfor the isolation and culture of primary calf hepato-cytes[J]. Vet J,2012,191(3) :323-326.
6Grummer RR, Impact of changes in organic nutrientmetabolism on feeding the transition cow. [J]. AnimSci ,1995,73(9):2820-2833.
7Drackley J R. Biology of dairy cows during the transi-tion period;The final frontier? [J]. J Dairy Sci,1999,82:2259-2273.
8Goff J P,Horst R L. Physiological changes at parturi-tion and their relationship to metabolic disorders [J].J Dairy Sci,1997,80(7) : 1260-1268.
9Ingvartsen K L, Andersen J B, Integration of metabo-lism and intake regulation: A review focusing on peri-parturient animals[j]. J Dairy Sci,2000,83(7) ; 1573-1597.
10Friggens N C, Andersen J B, Larsen T, et al. Primingthe dairy cow for lactation: A review of dry cow feed-ing strategies[J]. Anim Res,2004,53 -.453-473.