Biliverdin-based egg coloration is enhanced by carotenoid supplementation

  title={Biliverdin-based egg coloration is enhanced by carotenoid supplementation},
  author={J. Morales and Alberto Velando and Roxana Torres},
  journal={Behavioral Ecology and Sociobiology},
Avian eggshell color is remarkably variable among and within species and its possible function has long been controversial. Female birds use biliverdin pigment to color their eggs blue and green. Although evidence is accumulating that blue-green eggshell coloration is costly to produce, the exact mechanisms underlying its expression are little studied. Biliverdin pigment is involved in important maintenance functions such as immune and antioxidant defenses and shows similar properties to… CONTINUE READING