9[1]Elliott L, McMahon K J, Gier H T, et al. Uterus of the cow after parturition:Bacterial content[J].Am J Vet Res, 1996, (29):77-81.
10[2]Gilbert R O, Schwark W S. Pharmacologic considerations in the management of peripartum conditions in the cow [J].Vet Clin North Am, 1992, (8):29-56