Oxidative stress arises when the production of free radicals
surpasses the capacity of the natural antioxidative system in
living organisms (Sies, 1991). The oxidative stress leads to peroxidative
damage of cell membranes and macromolecules
(Girotti, 1998), and could contribute to and/or get involved in
the incidence of several disorders in cattle (Miller et al.,
1993).