Table 2. Muscle fiber area percentage of different livestock in Korea

Animals and treatments	Muscle type	Muscle fiber types (%)
Animals and treatments	Muscle type	Type I	Type IIA	Type IIB
Korean native black goat¹⁾			Young goat
Age	Longissimus dorsi	19.08^c	41.46^a	39.46^d
	Psoas major	44.36^a	25.66^d	29.98^e
	Semimembranosus	26.18^b	33.50^bc	40.32^cd
	Gluteus medius	27.78^b	34.62^b	37.60^d
			Adult goat
	Longissimus dorsi	20.14^c	31.08^bcd	48.78^ab
	Psoas major	46.12^a	27.76^cd	26.12^e
	Semimembranosus	28.68^b	18.50^e	52.82^a
	Gluteus medius	26.14^b	27.98^bcd	45.88^bc
	SEM	2.620	3.256	2.686
Hanwoo beef²⁾	Longissimus dorsi	24.3	12.4	63.7
	Psoas major	31.9	16.2	52.9
	Semimembranosus	8.0	22.6	69.4
Pork³⁾	Longissimus lumborum	5.76±0.78^C	4.76±1.00^B	89.48±0.93^A
Castration	Psoas major	9.63±1.61^B	20.46±2.10^A	69.91±3.28^B
Castration	Infra spinam	51.06±2.86^A	20.24±2.74^A	28.70±2.20^C

Korean native black goat data were collected from 10 castrated male goats: five young goats (9 months old) and five adult goats (18 months old). Muscle fiber area percentages were measured for four muscles: Longissimus dorsi, psoas major, semimembranosus, and gluteus medius. Values are expressed as means, with SEM calculated for each muscle type across all goat ages. ^a–e Superscripts indicate significant differences (p<0.001) within the same column. Data from Hwang et al. (2019).
Hanwoo beef data were collected from 18 Korean native cattle steers graded as Korean Carcass Grade 1++ by the Korean Animal Products Grading Service. Muscle fiber area percentages were measured for three muscles: Longissimus dorsi, psoas major, and semimembranosus. Data are presented as mean values, and no SD, SE, or SEM was provided in the original document. Data from Hwang et al. (2010).
Pork data were collected from eight castrated crossbred pigs (Landrace×Yorkshire×Duroc). Muscle fiber area percentages were measured for three muscles: Longissimus lumborum, psoas major, and infra spinam. Values are presented as means±SE (n=8). ^A–C Superscripts indicate significant differences (p<0.05) within the same column. Data from Hwang et al. (2018b).