a trend toward significanceP = 0.08
P < 0.05 was considered statistically significant and 0.05 < P < 0.10 was considered a trend toward significance. 3 Results 3.1 Growth performance As shown in Table 3 , final weight ( P = 0.08) and ADG ( P = 0.06) of the pigs fed with 0.25% betaine were higher than those of control group, but no difference was observed between the glycine and the control groups.