Enhanced C-type lysozyme content of wood duck (Aix sponsa) egg white: an adaptation to cavity nesting?

Physiological and Biochemical Zoology : PBZ
Olivier Wellman-LabadieMaxwell T Hincke

Abstract

Abstract Wild waterfowl species often nest in conditions where high humidity and microbial contamination may influence egg survival and quality. Albumen is traditionally regarded as the major impediment to microbial contamination of eggs, and its composition and activity may be selected by environmental pressures. Egg white protein from the eggs of wood duck (Aix sponsa), hooded merganser (Lophodytes cucullatus), Canada goose (Branta canadensis), and mute swan (Cygnus olor) was evaluated in order to compare the antimicrobial defenses of these species. Ovotransferrin and ovalbumin were identified in all species, but c-type lysozyme was present only in wood duck and hooded merganser egg white samples. Wood duck egg white showed the greatest bacterial activity as well as the highest lysozyme content. Egg white from wood duck and hooded merganser possessed greater lysozyme activity under acidic conditions, suggesting a c-type lysozyme with a pH optimum lower than that of Gallus gallus c-type lysozyme or the presence of g-type lysozyme. Ovotransferrin bacteriostatic activity appeared to be similar across the species investigated. The results suggest that lysozyme and ovotransferrin play a role in the antimicrobial defense of the avi...Continue Reading

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Citations

Feb 22, 2008·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Olivier Wellman-LabadieMaxwell T Hincke
Jul 25, 2015·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Veronika JavůrkováLudmila Hyánková
Sep 2, 2010·Journal of Agricultural and Food Chemistry·Olivier Wellman-LabadieMaxwell T Hincke

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