A: Dietary betaine significantly decreases hepatic triglycerides (TGs) content in laying hens. This reduction is associated with the suppression of sterol regulatory element binding transcription factor 1 (SREBP1), fatty acid synthase (FASN), and stearoyl-CoA desaturase (SCD) gene expression, and the activation of carnitine palmitoyl transferase 1A (CPT1A) gene expression. Furthermore, betaine supplementation leads to higher 5mC methylation levels on FASN and SCD gene promoters, lower 5mC methylation levels on CPT1A gene promoter, and an increased m6A methylation level on the 3' untranslated region of SREBP1 mRNA.