Arithmetic means and SD were calculated for all. The piglet was used the experimental unit; piglets were selected from different pens and 3 different successive trial periods. A t-test was used with the SPSS software (15.0, IBM, Somers, NY) to determine statistically sig- nificant differences at the P ≤ 0.05 level after testing for normality by the Shapiro-Wilk test and homoge- neity of variances.