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Serum CK level of different group at 42 days of age in flock 2.
| Group | Compression force range (N) | Compression force (N) | Creatine kinase (U/ml) | N |
| Normal | <4 | 2.4 ± 0.9a | 4.6 ± 1.3d | 49 |
| Mild | 4–5.5 | 4.3 ± 0.2b | 5.1 ± 1.5e | 13 |
| Moderate | ≥5.5 | 6.2 ± 0.8c | 6.4 ± 1.5f | 8 |
| P-value | <0.001 | <0.05 |
a,b,cDifferent letters indicate significant difference (P < 0.001), d,e,fdifferent letters indicate significant difference (P < 0.05).
