Table 2 Muscular characteristics of TB and RA muscles from Charolais steers (first study)
From: Specific fibre composition and metabolism of the rectus abdominis muscle of bovine Charolais cattle
First study (19 Charolais steers) | |||
|---|---|---|---|
RA muscle | TB muscle | Significance: | |
Number of steers | 19 | 19 | |
Different types of fibres according to histochemical analysis | |||
SO fibre proportion (%) | 37.8 (12) | 28.0 (1.9) | p < 0.001 |
FOG fibre proportion (%) | 8.3 (13) | 19.6 (0.9) | p < 0.001 |
FG fibre proportion (%) | 53.9 (13) | 52.4 (1.9) | p > 0.10 |
Fibre cross-sectional area according to histochemical analysis | |||
SO | 3957 (139) | 1725 (359) | p < 0.001 |
FOG | 3414 (105) | 1961 (170) | p = 0.003 |
FG | 2868 (103) | 2436 (137) | p = 0.041 |
Mean | 3324 (94) | 2142 (168) | p < 0.001 |
Different types of fibres according to immuno-histochemical analysis | |||
Fibre I proportion (%) | 40.4 (1.4) | 27.6 (2.5) | p < 0.001 |
Fibre IIC proportion (%) | 0.10 (0.05) | 0.30 (0.20) | p > 0.10 |
Fibre IIA proportion (%) | 30.7 (2.3) | 23.9 (3.9) | p = 0.021 |
Fibre IIAX proportion (%) | 5.4 (2.4) | 5.8 (1.4) | p > 0.10 |
Fibre IIX proportion (%) | 23.6 (1.9) | 42.4 (4.7) | p < 0.001 |
Myosin heavy chain (MyHC) isoforms (SDS-PAGE electrophoresis) | |||
MyHC I proportion (%) | 38.5 (0.7) | 20.7 (1.6) | p = 0.003 |
MyHC IIa proportion (%) | 33.3 (0.7) | 25.5 (2.4) | p < 0.001 |
MyHC IIx proportion (%) | 28.2 (1.0) | 53.8 (3.1) | p < 0.001 |
Metabolic type of muscles (enzyme activity determination) | |||
ICDH activity (μmol.min.-1.g-1) | 1.27 (0.05) | 2.35 (0.06) | p < 0.001 |
LDH activity (μmol.min.-1.g-1) | 617 (1.7) | 753 (19) | p < 0.001 |
COX activity (μmol.min.-1.g-1) | 7.6 (0.7) | 11.0 (0.9) | p = 0.003 |
LDH/ICDH ratio | 522 (15) | 340 (28) | p < 0.001 |