Comparative Study on Muscle Fiber Types of Longissimus Dorsi of Xinjiang Brown Cattle and Angus Cattle of Different Months

Table 4

Comparison of CSA of different types of muscle fibers between the same month of Xinjiang brown cattle and Angus cattle in the longissimus dorsi muscle (μm²).

Age (m)	Breed	Type I (ATP)	Type IIa (SDH)	Type IIb (SDH)	Type IIx (ATP)
3	Bc	361.03 ± 13.51 A	292.66 ± 12.19 A	981.99 ± 55.71 A	460.10 ± 16.54
	An	534.28 ± 28.99 B	407.87 ± 22.6 5 B	623.76 ± 31.40 B	492.24 ± 20.07
7	Bc	1031.45 ± 43.15a	1012.08 ± 63.10	2664.59 ± 231.43	1560.64 ± 105.23
	An	1174.43 ± 45.66 b	918.06 ± 55.51	2554.35 ± 252.66	1394.44 ± 94.00
12	Bc	1628.82 ± 97.05 A	1270.22 ± 68.88 A	2813.87 ± 210.34	1922.69 ± 98.83a
	An	1033.78 ± 39.08 B	990.01 ± 44.45 B	2641.40 ± 205.23	1669.91 ± 69.03 b
24	Bc	2287.74 ± 231.14	1699.44 ± 44.68 A	3157.79 ± 132.20 A	2355.23 ± 134.63 A
	An	2135.74 ± 305.02	1469.53 ± 35.89 B	2316.63 ± 92.25 B	1646.06 ± 58.74 B