Table 2. Acidity (Dornic Degree) of drinking yogurt samples during cold storage (mean±SD)

Sample	First day	11th day	21th day
C	84.54±0.08Ca	96.40±0.11Ba	96.81±0.09Aa
FE250	84.30±0.10Cb	90.14±0.12Bb	92.54±0.11Ab
FE500	84.43±0.12Cb	86.35±0.09Bc	91.80±0.11Ac
IE250	83.66±0.11Cc	85.18±0.12Bd	91.80±0.11Ac
IE500	83.54±0.10Cc	84.59±0.12Be	91.36±0.11Ad

Values in the same column shown with similar lowercase letters are not significantly different.
Values in the same rows shown with similar capital letters are not significantly different.