Table 4.
The effects of generation, layer line, housing system, post mortem keel bone deformity and fracture and their interactions on the results of the bone mineral density (BMD) of the keel bone.
| Effect | BMD (g/cm2) | Effect | BMD (g/cm2) | ||
|---|---|---|---|---|---|
| F Value | p -Value | F Value | p -Value | ||
| Generation (G) | 39.13 | <0.001 | LL × HS | 3.87 | 0.009 |
| Layer line (LL) | 14.62 | <0.001 | LL × KBD | 0.286 | 0.944 |
| Housing system (HS) | 44.73 | <0.001 | LL × KBF | 2.15 | 0.092 |
| Keel bone deformity (KBD) | 7.57 | <0.001 | HS × KBD | 4.89 | 0.008 |
| Keel bone fracture (KBF) | 0.005 | 0.942 | HS × KBF | 1.72 | 0.189 |
| G ×LL | 2.36 | 0.074 | KBD × KBF | 1.56 | 0.210 |
| G × HS | 0.895 | 0.345 | a | 12.31 | <0.001 |
| G × KBD | 1.44 | 0.238 | b | 0.284 | 0.889 |
| G × KBF | 1.15 | 0.283 | c | 0.422 | 0.793 |
Parameters of the Gompertz growth curve: a = adult body weight (g) of the hen at 69 weeks of age (asymptotic limit), b = slope of the curve, c = point of inflection (week).