Table 6. Nucleotide contents and K-index of porcine M. subscapularis muscle from LYD, Berkshire, and Ibérico pigs

Items	LYD	Berkshire sow	Berkshire barrow	Ibérico	SEM¹⁾
Nucleotide contents (mg/100 g)
AMP	4.64^b	4.28^b	5.16^ab	5.72^a	0.23
GMP	2.21	2.41	2.26	1.43	0.29
IMP	68.35^a	103.82^a	104.45^a	28.47^b	10.51
Inosine	43.90	49.07	48.31	35.78	5.87
Hypoxanthine	88.73^b	71.95^b	57.84^b	160.76^a	9.44
K-index²⁾ (%)	79.92^b	70.55^b	66.80^b	94.21^a	3.37

Values with different superscripts letters within the same row differ significantly (p<0.05).
n=12.
K-index = [Inosine] + [Hypoxanthine] / [IMP] + [Inosine] + [Hypoxanthine] × 100.
LYD, Landrace×Yorkshire×Duroc; AMP, adenosine-5’-monophosphate; GMP, goanosine monophosphate; IMP, inosine-5’-monophosphate.