Table 1.

Effects of exogenous phytase on apparent ileal digestibility coefficients of 17 amino acids in one meta-analysis [48] and two individual assays [46,47].

Amino Acid	Cowieson et al. [48]			Martinez-Vallespin et al. [47]			Amerah et al. [46]
	Nil	Plus	Response (%)	Nil	1000 FTU/kg	Response (%)	Nil	1000 FTU/kg	Response (%)
Arginine	0.86	0.89	3.49	0.859	0.899	4.66	0.823	0.900	9.36
Histidine	0.80	0.84	5.00	0.725	0.841	16.00	0.730	0.821	12.47
Isoleucine	0.79	0.85	7.59	0.743	0.794	6.86	0.721	0.821	13.87
Leucine	0.82	0.85	3.66	0.749	0.826	10.28	0.722	0.826	14.40
Lysine	0.83	0.86	3.61	0.804	0.862	7.21	0.806	0.889	10.30
Methionine	0.89	0.90	1.12	0.768	0.883	14.97	0.880	0.928	5.45
Phenylalanine	0.82	0.85	3.66	0.806	0.858	6.45	0.737	0.834	13.16
Threonine	0.73	0.77	5.48	0.646	0.752	16.41	0.661	0.765	15.73
Valine	0.78	0.82	5.13	0.689	0.730	5.95	0.669	0.774	15.70
Alanine	0.80	0.83	3.75	0.731	0.818	11.90	0.699	0.807	15.45
Aspartic acid	0.79	0.82	3.80	0.796	0.835	4.90	0.756	0.850	12.43
Cysteine	0.68	0.72	5.88	0.478	0.681	42.47	0.543	0.685	26.15
Glutamic acid	0.87	0.90	3.45	0.833	0.888	6.60	0.807	0.882	9.29
Glycine	0.76	0.79	3.95	0.636	0.749	17.77	0.658	0.765	16.26
Proline	0.80	0.83	3.75	0.789	0.809	2.53	0.722	0.812	12.47
Serine	0.78	0.81	3.85	0.723	0.805	11.34	0.684	0.809	18.27
Tyrosine	0.80	0.83	3.75	0.767	0.813	6.00	0.755	0.844	11.79
Mean	0.800	0.833	4.13	0.738	0.814	10.30	0.728	0.824	13.19