Betaine affects abdominal flare fat metabolism via regulating m6A RNA methylation in finishing pigs fed a low-energy diet

[Display omitted] •There is an interaction between betaine and dietary energy for lipid metabolism.•Betaine decreases the content of flare fat in finishing pigs fed a low-energy diets.•Betaine affects the lipid metabolism of flare fat via regulating m6A RNA methylation. This study was conducted to investigate the effects of betaine on lipid metabolism and m6A RNA methylation in finishing pigs fed a low-energy diet. The results showed that betaine significantly enhanced serum concentration of triglyceride and reduced the relative weight of flare fat (P