Table 3.

Effect of the Lys-Lys dipeptide on serum amino acids in piglets^a.

Item	Control	0.1% Lys-Lys	1% Lys-Lys	5% Lys-Lys
Lysine	44.96 ± 2.74	49.08 ± 0.16	80.57 ± 3.80*	63.10 ± 5.10*
Methionine	11.86 ± 0.83	13.52 ± 1.70	14.69 ± 2.18	12.80 ± 1.33
Valine	42.20 ± 4.64	40.34 ± 4.37	53.11 ± 7.27	48.59 ± 3.86
Isoleucine	26.63 ± 2.39	26.88 ± 1.74	29.20 ± 3.12	34.71 ± 1.75*
Leucine	34.25 ± 3.83	33.22 ± 1.99	45.76 ± 3.78	41.18 ± 3.53
Threonine	19.96 ± 1.23	22.64 ± 2.81	30.65 ± 3.95*	31.72 ± 3.00**
Tryptophan	7.91 ± 0.47	7.73 ± 0.54	10.10 ± 1.06	8.63 ± 0.70
Phenylalanine	19.87 ± 1.30	19.49 ± 1.17	25.54 ± 2.02*	23.02 ± 1.85
Histone	14.33 ± 1.66	15.11 ± 1.47	19.52 ± 2.36	13.35 ± 3.93
Serine	22.52 ± 1.86	22.29 ± 1.68	29.22 ± 3.49	24.96 ± 1.91
Arginine	22.78 ± 2.60	19.77 ± 1.84	30.08 ± 3.53	25.77 ± 3.61
Glycine	77.64 ± 12.13	80.08 ± 6.83	99.34 ± 8.17	88.17 ± 8.65
Aspartate	4.54 ± 0.72	4.98 ± 0.70	5.98 ± 0.96	7.36 ± 1.02*
Glutamate	79.81 ± 11.44	92.65 ± 5.70	107.53 ± 9.83	110.52 ± 3.37*
Tyrosine	31.91 ± 1.11	30.14 ± 1.54	35.05 ± 2.40	35.27 ± 1.93
Proline	33.73 ± 1.91	40.80 ± 2.40	60.21 ± 2.97**	45.90 ± 3.16*
Cysteine	10.37 ± 0.99	8.99 ± 0.81	6.26 ± 0.70**	12.64 ± 0.92
Alanine	82.19 ± 8.74	85.69 ± 3.26	92.04 ± 9.50	89.23 ± 8.52

^aData were expressed as the mean ± SEM (n = 7). *Different from control, P < 0.05;

^**Different from control, P < 0.01.