Table 9
Effects of protease and RFFS supplementations on the coefficient of standardized ileal digestibility of CP and AA of broilers at day 24

RFFS¹ (g/kg)	Protease (PROT/kg)	CP	Indispensable amino acids									Dispensable amino acids
RFFS¹ (g/kg)	Protease (PROT/kg)	CP	His	Arg	Thr	Lys	Met	Val	Ile	Leu	Phe	Ser	Gly	Al	Pro
0	0	0.804^b	0.873	0.932	0.851	0.887	0.966	0.847	0.853	0.864	0.867	0.860	0.828	0.870	0.853
	15,000	0.840^a	0.894	0.921	0.858	0.896	0.968	0.860	0.861	0.871	0.872	0.859	0.811	0.872	0.848
45	0	0.811^ab	0.868	0.916	0.837	0.875	0.963	0.821	0.824	0.840	0.848	0.827	0.780	0.837	0.826
	15,000	0.799^b	0.869	0.918	0.839	0.884	0.971	0.832	0.833	0.848	0.848	0.836	0.800	0.848	0.831
75	0	0.785^b	0.841	0.897	0.810	0.850	0.961	0.789	0.780	0.819	0.815	0.806	0.761	0.826	0.815
	15,000	0.803^b	0.853	0.907	0.825	0.873	0.962	0.803	0.802	0.823	0.830	0.812	0.770	0.828	0.813
SEM		0.004	0.005	0.004	0.004	0.004	0.002	0.006	0.007	0.006	0.005	0.005	0.006	0.004	0.005
Main effects
0		0.822	0.884^a	0.927^a	0.855^a	0.891^a	0.967	0.853^a	0.857^a	0.868^a	0.869^a	0.859^a	0.819^a	0.871^a	0.851^a
45		0.805	0.869^a	0.917^b	0.838^b	0.879^b	0.967	0.827^b	0.829^b	0.844^b	0.848^b	0.831^b	0.790^b	0.843^b	0.829^b
75		0.794	0.847^b	0.902^c	0.818^b	0.861^c	0.961	0.796^c	0.791^c	0.821^b	0.822^c	0.809^c	0.765^c	0.827^b	0.814^b
	0	0.800	0.861	0.915	0.833	0.871^b	0.963	0.819	0.819	0.841	0.843	0.831	0.789	0.844	0.831
	15,000	0.814	0.872	0.915	0.841	0.884^a	0.967	0.831	0.832	0.847	0.850	0.836	0.793	0.849	0.831
Sources of variation
RFFS		**	***	***	***	**	NS	***	***	**	***	***	***	***	***
Protease		*	NS	NS	NS	*	NS	NS	NS	NS	NS	NS	NS	NS	NS
RFFS x protease		*	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS