Fig. 2From: Refinement of intraperitoneal injection of sodium pentobarbital for euthanasia in laboratory rats (Rattus norvegicus)Time from delivery of the intraperitoneal injection to cessation of heart beat was fastest in the high-dose high-volume group (HH). LL = low-dose low-volume group, LH = low-dose high-volume group. *p < 0.05 **p = 0.002Back to article page