Carotenoids, Immunity, and Integumentary Coloration in Red Junglefowl (gallus Gallus)
نویسندگان
چکیده
A .—There is widespread interest in the roles that carotenoids play as yolk and shank pigments, antioxidants, and immune-system regulators in chickens, but nothing is known of such functions in the wild ancestors of chickens—the Red Junglefowl (Gallus gallus). We manipulated carotenoid access in the diet of captive male and female Red Junglefowl to investigate its eff ects on the coloration of the red comb and buff -brown legs and beak as well as on several indices of immunocompetence. Comb, leg, and beak did not diff er in coloration between control and carotenoid-supplemented groups; in fact, biochemical analyses showed that, unlike in chickens, leg and beak tissue contained no carotenoids. Carotenoids showed variable eff ects on immunological performance, boosting the potency of whole blood in males to kill bacterial colonies, while inhibiting the ability of macrophages to phagocytize bacterial cells and having no signifi cant eff ect on the accumulation of haptoglobin—an acute-phase protein whose production was induced by a simulated infectious challenge with lipopolysaccharide. These results bring into question interpretations of the evolutionary signifi cance of carotenoid-based and sexually dichromatic shank coloration in domestic chickens, which was apparently derived through artifi cial selection, and suggest that carotenoids can exert diff erent, mechanism-specifi c actions on the many lines of immune defense in birds. Received 1 July 2005, accepted 4 January 2006.
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تاریخ انتشار 2006