Table 5.

The effect of PROE supplementation on the apparent ileal digestibility coefficient (AID%) of amino acids.

Item	PROE0	PROE1	PROE2	PROE3	SEM	P-value
Lysine	83.54c	83.95b	85.00a	85.00a	0.180	0.001
Methionine	88.40d	88.91c	89.07b	89.83a	0.074	0.003
Threonine	85.18b	84.44c	84.32c	85.68a	0.115	0.001
Tryptophan	87.02	86.54	86.54	86.71	0.244	0.528
Arginine	89.08a,b	88.99b	89.25a	89.22a	0.058	0.035
Valine	84.83	84.91	84.83	84.83	0.077	0.904
Leucine	90.05c	90.05c	90.21b	90.63a	0.046	0.004
Isoleucine	84.91b	84.79b	85.15a	85.27a	0.093	0.001

Means within the same row carrying different superscripts are significantly different at (P < 0.05).

PROE0, basal diet without additives; PROE1, basal diet + phenolic rich onion extract (1 g/kg diet); PROE2, basal diet + phenolic rich onion extract (2 g/kg diet); PROE3, basal diet + phenolic rich onion extract (3 g/kg diet).