At week 8, the 6.6 ratio also significantly enhanced the SOD (P < 0.01) and TAC (P < 0.05) in seminal plasma more significantly than the other two ratios but showed no significant effect on the spermatozoa MDA, as compared with the 14.4 ratio, while the 2.2 dietary ratio decreased the SOD of the spermatozoa (P < 0.01) but increased the MDA in the spermatozoa and serum (P < 0.05) as compared with the 14.4 ratio. In addition, the diet supplemented with 400 mg/kg vitamin E, compared with the 200 mg/kg vitamin E, resulted in increased SOD in the seminal plasma and serum (P < 0.01), increased TAC in the sperm (P < 0.01),