As a general rule, approximately 7.0% of an animal's body weight is comprised of blood.
As a general rule, 15.0% of an animals total blood volume can be safely removed without severely harming the animal (of course fluid replacement therapy must be instituted if this maximum volume is removed)
As a general rule, animals will replace lost blood at a rate of 1 ml per pound body weight per 24 hours (1ml/lb/24hr)
Animals cannot be bled at a volume and frequency that does not allow them to replace their blood volume.
Questions concerning blood withdrawal from animals should be directed to Tracy Dolan, Research Facilities Coordinator (x 55483) or Dr. John Young, University Attending Veterinarian (310-423-7684).