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Seminal antioxidants levels in sperm of red junglefowl males. (a) seminal antioxidants in relation to plasma antioxidants (b) mean seminal antioxidants levels (±SE) in young (open circles) and old males (filled circles). Lines show an adjusted lineal regression (young males: y = 3.5x – 2.7, r = 0.91; old males: y = –0.2x + 3.8, r = 0.20).
