Fig. 1

Effect of betaine supplementation on serum parameters of lipid metabolism. The levels of serum free fatty acid (FFA, a), triglyceride (b), total cholesterol (c) and high-density lipoprotein cholesterol (HDLC, d). a,bValues without common superscript letters differ significantly (P < 0.05). Low betaine and high betaine represent 1250 mg/kg and 2500 mg/kg betaine addition, respectively