Table 4. Results and analyses of orthogonal test

Run A B C Viable bacterial Log CFU/g
1 1 1 1 11.77
2 1 2 2 12.47
3 1 3 3 11.89
4 2 1 2 12.50
5 2 2 3 11.94
6 2 3 1 12.23
7 3 1 3 11.27
8 3 2 1 12.02
9 3 3 2 12.23
K1 36.13 35.54 36.02
K2 36.67 36.43 37.20
K3 35.52 36.35 35.10
k1 12.043 11.847 12.007
k2 12.223 12.143 12.400
k3 11.840 12.117 11.700
r 0.383 0.296 0.700
Order C>A>B
Optimal level A2 B2 C2
A, ratio of bacteria to protective agents; B, feed flow rate; C, temperature.