Plasma metabolomic profiling during peri-parturition in healthy Thoroughbred mares.
Authors: Li Junjie, Matsumoto Touko, Liu Hong, Li Chunmei, Murase Harutaka, Yamamoto Yuki, Nagaoka Kentaro
Journal: Equine veterinary journal
Summary
# Editorial Summary Predicting parturition timing in mares remains challenging due to highly variable gestation lengths and the subtle metabolic shifts preceding foaling, which prompted this investigation into plasma metabolite profiles across the periparturient period. Researchers collected 95 plasma samples from 9 healthy Thoroughbred mares across a 11-day window (4 days pre-foaling through 7 days post-foaling), performing untargeted metabolomic analysis using gas chromatography–mass spectrometry followed by principal component analysis and repeated-measures ANOVA to identify significant metabolic changes. Sixty-two metabolites demonstrated statistically significant variation across the study period, with particular enrichment in pathways governing amino acid metabolism (branched-chain amino acids, arginine and alanine metabolism), galactose metabolism, and CoA biosynthesis; notably, glycerol-3-phosphate concentrations increased distinctly approximately 3 days before parturition. Glycerol-3-phosphate emerges as a promising candidate biomarker for foaling prediction, potentially offering practitioners a biochemical marker to refine parturition forecasting—though the modest sample size and lack of quantitative reference ranges necessitate validation in larger populations before clinical application. This metabolomic framework provides valuable mechanistic insight into periparturient physiology and establishes groundwork for developing improved predictive protocols in breeding programmes.
Read the full abstract on PubMed
Practical Takeaways
- •G3P measurement in mare plasma may provide a non-invasive biomarker to predict parturition timing within 3 days, improving foaling watch protocols and reducing complications
- •Periparturition metabolic profiling reveals shifts in amino acid and energy metabolism that could guide nutritional management strategies in late pregnancy
- •While promising for future clinical application, this finding requires larger sample validation and quantitative reference ranges before implementation in practice
Key Findings
- •62 metabolites showed significant differences across pre-parturition, parturition, and post-parturition periods (FDR <0.05)
- •Glycerol-3-phosphate (G3P) increased 3 days before parturition, emerging as a potential biomarker for parturition prediction
- •Significant enrichment in 7 metabolic pathways including branched-chain amino acid metabolism, galactose metabolism, and arginine biosynthesis
- •Principal component analysis and hierarchical clustering demonstrated distinct metabolic clustering between periparturition phases