Serum lipidome analysis of healthy beagle dogs receiving different diets

Introduction: Food and dietary ingredients have significant effects on metabolism and health. Objective: To evaluate whether and how different diets affected the serum lipidomic profile of dogs. Methods: Sixteen healthy beagles were fed a commercial dry diet for 3 months (control diet). After an overnight fasting period, a blood sample was taken for serum lipidomic profile analysis, and each dog was then randomly assigned to one of two groups. Group 1 was fed a commercial diet (Diet 1) and group 2 was fed a self-made, balanced diet supplemented with linseed oil and salmon oil (Diet 2) for 3 months. After an overnight fasting period, a blood sample was taken from each dog. Serum cholesterol and triacylglycerol analyses were performed and the serum lipidomic profiles were analyzed using targeted liquid chromatography–mass spectrometry. Results: Dogs fed the supplemented self-made diet (Diet 2) had significantly higher omega-3 fatty acid-containing lipids species and significantly lower saturated and mono- and di-unsaturated lipid species. Concentrations of sphingosine 1-phosphate species S1P d16:1 and S1P d17:1 were significantly increased after feeding Diet 2. Conclusion: This study found that different diets had significant effects on the dog’s serum lipidomic profile. Therefore, in studies that include lipidomic analyses, diet should be included as a confounding factor.