Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40104-017-0200-6/MediaObjects/40104_2017_200_Fig1_HTML.gif)
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