Table 1.

Myosin heavy chain (MyHC) composition of various muscle samples from Japanese Black steers (%)

Muscle	MyHC1	MyHC2	Standard deviation	Minimum MyHC1	Maximum MyHC1
Rectus femoris	6.9	93.1	3.9	2.4	9.3
Semitendinosus	8.8	91.2	5.7	3.2	14.6
Semimembranosus	12.5	87.5	2.2	10.9	15.0
Longissimus thoracis	14.8	85.2	8.3	7.1	23.6
Biceps femoris (distal portion)	15.5	84.5	1.5	13.8	16.6
Vastus lateralis	16.5	83.5	2.7	14.9	19.6
Latissimus dorsi	24.1	75.9	8.9	18.6	34.4
Psoas major	30.4	69.6	4.5	25.2	33.8
Rhomboideus thoracis	37.0	63.0	11.1	24.3	45.3
Splenius capitis	43.1	56.9	28.7	10.1	62.8
Biceps femoris (proximal portion)	46.1	53.9	17.8	35.6	66.6
Spinalis and semispinalis	54.5	45.5	10.8	45.5	66.5
Subscapularis	55.1	44.9	8.8	46.7	64.3
Trapezius	56.6	43.4	26.6	27.6	80.0
External oblique	57.1	42.9	2.4	55.0	59.7
Seratus cervicis	60.6	39.4	23.3	46.1	87.4
Iliacus	67.0	33.0	1.0	66.2	68.1
Infraspinous	71.8	28.2	12.6	60.9	85.6
Flexor digitorum superficialis	71.8	28.2	21.3	54.5	95.5
Gluteus accesorius	78.6	21.4	7.7	70.1	85.2
Serratus ventralis	83.3	16.7	12.2	69.1	90.6

Note. The data are from three Japanese Black steers.

Minimum and maximum MyHC1 values are across the three cattle.