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An investigation was conducted with turkeys during the spring-summer seasons of 2008 to 2011. Each season the turkeys were allocated to three treatments. The control received a standard compound feed. In the second treatment, a natural feed additive, consisting of 5% extracted polyphenols from Cynara scolymus, was included in the diet, and the third consisted of a synthetic antioxidant mixture containing 17% butylhydroxytoluene (BHT), 6% propyl gallate, 2.4% etoxyquin and 25% citric acid. Blooddoi:10.4314/sajas.v43i4.4 fatcat:pzugqef5ovd7dh65wwwli3fgte