Research Note: Changes in chicken egg yolk metabolome during its formation

Area of Science:

• Biochemistry
• Animal Science
• Reproductive Biology

Background:

• Egg yolk formation is a complex biological process.
• It involves the transport and deposition of numerous small molecule metabolites.
• Understanding these metabolic processes is crucial for optimizing egg quality and nutritional value.

Purpose of the Study:

• To perform a qualitative and relative quantitative analysis of metabolites during egg yolk formation.
• To identify dominant metabolite categories and their roles in follicular development.
• To elucidate the nutrient deposition patterns and nutritional properties of egg yolk.

Main Methods:

• Utilized liquid chromatography-tandem mass spectrometry (LC-MS/MS) for metabolite analysis.
• Analyzed metabolites across three distinct egg yolk formation periods.
• Identified and quantified a comprehensive range of small molecule metabolites.

Main Results:

• Identified a total of 398 metabolites in egg yolk.
• Dominant metabolite categories included amino acids, lipids, and organic acids.
• Found deposition of amino acids, organic acids, and nucleotides, with consumption of vitamins and carbohydrates during follicular development.

Conclusions:

• Egg yolk formation involves significant nutrient deposition and consumption to support embryonic development.
• The small hierarchical follicle (SF) stage is critical for regulating active ingredient transport and deposition.
• Results enhance understanding of egg yolk's nutritional composition and deposition patterns.