A metabolomics comparison between sheep's and goat's milk

Area of Science:

• Food Science
• Analytical Chemistry
• Animal Science

Background:

• Bovine milk dominates global consumption, but small ruminant dairy (goat and sheep) is increasingly popular, particularly in the Mediterranean.
• Understanding the unique metabolite profiles of sheep and goat milk is crucial for quality assessment and product development.
• Metabolomics offers a powerful tool to explore the complex chemical composition of milk.

Purpose of the Study:

• To comprehensively analyze and compare the untargeted metabolite profiles of sheep's and goat's milk.
• To identify specific metabolites that differentiate between sheep and goat milk.
• To investigate the associations between milk metabolite profiles and key compositional traits (e.g., protein, fat).

Main Methods:

• Utilized an untargeted metabolomics approach.
• Employed gas chromatography coupled with mass spectrometry (GC-MS) for metabolite profiling.
• Analyzed milk samples from 30 sheep and 28 goats.

Main Results:

• Identified distinct metabolite profiles for sheep and goat milk.
• Sheep milk showed higher abundance of arabitol, citric acid, α-ketoglutaric acid, glyceric acid, myo-inositol, and glycine.
• Goat milk exhibited higher levels of mannose-6-phosphate, isomaltulose, valine, pyroglutamic acid, leucine, and fucose.
• Established correlations between metabolite profiles and milk composition: protein content in sheep milk and fat content in goat milk.

Conclusions:

• The study reveals significant metabolic differences between sheep and goat milk.
• Metabolite profiles can serve as indicators for milk composition and quality in small ruminants.
• This research enhances the understanding of small ruminant milk metabolites and their implications for dairy product evaluation.