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Related Experiment Videos

A study on eggshell pigmentation: biliverdin in blue-shelled chickens.

R Zhao1, G Y Xu, Z Z Liu

  • 1College of Animal Science and Technology, China Agricultural University, Beijing 100094, P R China.

Poultry Science
|March 24, 2006
PubMed
Summary

Biliverdin, a key eggshell pigment, is synthesized in the chicken shell gland, not the blood. This finding clarifies the biochemical pathway for avian eggshell coloration.

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Area of Science:

  • Avian biology
  • Biochemistry
  • Genetics

Background:

  • Biliverdin is a crucial pigment responsible for eggshell coloration in chickens and other avian species.
  • Identifying the biosynthesis site of eggshell biliverdin is vital for understanding eggshell pigmentation's biochemical and genetic underpinnings.

Purpose of the Study:

  • To determine whether blood or the shell gland is the primary site of biliverdin biosynthesis in chickens.
  • To elucidate the role of the shell gland in avian eggshell pigmentation.

Main Methods:

  • Utilized a segregation population of a native Chinese chicken breed with distinct eggshell colors (blue vs. light brown).
  • Employed ultraviolet spectrophotometry and High-Performance Liquid Chromatography (HPLC) to quantify biliverdin concentrations.

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  • Analyzed biliverdin levels in eggshells, blood, bile, excreta, and the shell gland.

    • Main Results:

    • Significantly higher biliverdin content was observed in the eggshells of blue-shelled chickens compared to brown-shelled chickens (P < 0.01).
    • No significant differences in biliverdin concentration were found in blood, bile, or excreta between the two groups.
    • The shell gland exhibited significantly higher biliverdin concentrations in blue-shelled chickens (8.25 ± 2.55 nmol/g) compared to brown-shelled chickens (1.29 ± 0.12 nmol/g) (P < 0.01).

    Conclusions:

    • The study concludes that blood is not the site of eggshell biliverdin biosynthesis.
    • Evidence strongly suggests that biliverdin is synthesized within the shell gland and subsequently deposited onto the eggshell.
    • This finding advances our understanding of the mechanisms controlling avian eggshell pigmentation.