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Serum creatine kinase (CK) level of different groups at 42 days of age in flock 1.
| Group | Compression force range (N) | Compression force (N) | Creatine kinase (U/ml) | N |
| Normal | <4 | 3.2 ± 0.6a | 4.8 ± 1.5a | 39 |
| Mild | 4–5.5 | 4.6 ± 0.3b | 6.3 ± 1.6b | 36 |
| Moderate | ≥5.5 | 6.4 ± 1.0c | 8.7 ± 1.6c | 17 |
| P-value | <0.001 | <0.001 |
a,b,cDifferent letters indicate significant difference (P < 0.001).
