Table 6. Amino acid contents (% in sample) of horse leg bone extract powders from Jeju crossbred horses

Amino Acid	Age (mon)

	28	32	38
Aspartic acid	3.81 ± 0.050^c	4.07 ± 0.025^b	4.82 ± 0.005^a
Threonine	1.15 ± 0.065^b	1.22 ± 0.000^b	1.44 ± 0.025^a
Serine	1.92 ± 0.045^c	2.15 ± 0.010^b	2.54 ± 0.005^a
Glutamic acid	6.70 ± 0.050^c	7.14 ± 0.015^b	8.53 ± 0.010^a
Proline	6.99 ± 0.030^b	7.01 ± 0.000^b	8.55 ± 0.090^a
Glycine	13.17 ± 0.030^c	13.84 ± 0.040^b	17.40 ± 0.060^a
Alanine	4.96 ± 0.125^b	5.17 ± 0.010^b	6.35 ± 0.005^a
Valine	1.92 ± 0.085^b	2.10 ± 0.010^b	2.47 ± 0.025^a
Isoleucine	0.87 ± 0.010^b	0.92 ± 0.010^b	1.05 ± 0.020^a
Leucine	2.25 ± 0.020^c	2.40 ± 0.015^b	2.71 ± 0.035^a
Tyrosine	0.09 ± 0.020^b	0.34 ± 0.045^a	0.39 ± 0.045^a
Phenylalanine	1.36 ± 0.040^b	1.53 ± 0.035^ab	1.73 ± 0.060^a
Histidine	1.22 ± 0.020^a	1.06 ± 0.035^b	1.02 ± 0.020^b
Lysine	2.25 ± 0.010^c	2.41 ± 0.015^b	2.98 ± 0.045^a
Arginine	4.62 ± 0.165^b	4.71 ± 0.035^b	5.86 ± 0.090^a