I advice you to also try others methods as ORAC, or if you want to see more than just antioxidant activity try assess lipid peroxidation by estimating the production of free malondialdehyde (MDA). Look for methods that provide radicals for assess antioxidant activity that are present in human and rabbits. Later, it will be more helpful to you to discuss your results. ORAC method provide H2O2 as a radical, which is one the most importantly free radicals presents in human body.
If you search for "MDA methods" you will find few articles about it, the same for "ORAC method".