The KRL value of piglets’ whole blood (A) and red blood cells (B), covaried by KRL values at the beginning of the trial, in relation to dietary treatments and sampling time. Data are reported as mean ± SEM; n = 16. C, control group; BOS, diet supplemented with B. serrata extract; UT, diet supplemented with U. tomentosa and T. parthenium extracts; AOX, diet supplemented with antioxidant plant extract mixture. For whole blood: Treatment p = 0.123; Time p = 0.543; Time × Treatment interaction, p = 0.002. For red blood cells: Treatment p = 0.003; Time p = 0.795; Time × Treatment interaction p = 0.014.