The effect of astaxanthin on egg yolk colour, production and animal health

Astaxanthin is an important fat-soluble pigment that naturally occurs in algae, bacteria, and yeast. Dietary supplementation of astaxanthin affects egg yolk indices, egg production, antioxidative status, immune function, metabolism, and fertility. Considering the increasing global egg consumption, it is important to naturally enrich the yolk without adversely affecting egg production and egg physical properties. Carotenoids are red, orange, and yellow pigments produced by photosynthetic organ