Table 4. Effects of wet-aging time on bitter free amino acids (mg/100 g) concentration of LL and BF muscles from KNBG meat

FAA	Treatment	Days of aging				SEM (n=8)
FAA	Treatment	0	5	10	15	SEM (n=8)
Valine (bitter)	LL	42.08^cx	62.77^bc	90.09^ab	116.45^a	11.58
	BF	23.60^dy	55.33^z	95.21^b	150.86^a	3.75
	SEM	2.86	7.02	9.91	11.85
Methionine (bitter)	LL	16.39^b	46.78^ab	59.58^a	73.56^a	9.92
	BF	12.84^z	23.84^z	65.35^b	92.50^a	4.41
	SEM	1.07	6.67	8.45	10.90
Isoleucine (very bitter)	LL	24.75^b	38.48^b	53.67^b	87.48^a	9.46
	BF	17.32^d	31.83^z	57.90^b	104.06^a	1.67
	SEM	4.87	3.25	5.08	11.16
Leucine (bitter)	LL	37.36^b	107.28^aab	142.00^a	197.54^a	23.17
	BF	38.55^d	68.38^bz	146.78^b	234.40^a	4.30
	SEM	6.49	9.80	12.55	28.56
Arginine (bitter)	LL	15.65	36.82	578.65	162.00	269.66
	BF	31.51	14.78	63.32	162.10	45.60
	SEM	6.62	9.13	377.86	81.78
Phenylalanine (bitter)	LL	20.93^bx	47.56^ab	69.99^a	82.87^a	9.94
	BF	12.94^dy	31.93^z	73.21^b	99.98^a	4.27
	SEM	0.91	4.64	10.41	10.18
Histidine (bitter)	LL	18.57^z	39.96^bx	41.67^by	62.42^a	3.79
	BF	19.73	30.57^y	55.02^x	64.56	1.53
	SEM	1.67	1.34	1.70	5.10

Mean values with different letters within the same row differ significantly (p < 0.05).
Mean values with different letters within the same column differ significantly (p < 0.05).
LL, longissimus lumborum; BF, biceps femoris; KNBG, Korean native black goat; FFA, free amino acid.