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Table 1 Experimental factors and respective levels used in the Box-Behnken design

From: The influence of phytase, pre-pellet cracked maize and dietary crude protein level on broiler performance via response surface methodology

Factor

Level (− 1)

Level (0)

Level (+ 1)

Phytase, FTU/kg

0

750

1500

Crude protein, %

17

19.5

22

Cracked maize, %

0

15

30