Table 2.
Humerus and tibia cortical density (milligrams per cubic centimeter) of 16 wk White Leghorn pullets housed in AV system and CCs.1
| Planar orientation of bone | |||||
|---|---|---|---|---|---|
| Bone type and housing | Medial2 | Lateral | Anterior | Posterior | Average |
| Humerus | |||||
| Proximal | |||||
| AV | 247.18 ± 7.09 | 259.25 ± 7.65 | 296.10 ± 8.47 | 280.36 ± 8.12 | 275.58 ± 7.08 |
| CC | 203.28 ± 7.37 | 219.36 ± 7.94 | 210.42 ± 8.80 | 217.62 ± 8.43 | 218.73 ± 7.28 |
| P value | <.0001 | 0.0004 | <.0001 | <.0001 | <.0001 |
| Mid | |||||
| AV | 376.93 ± 10.25 | 378.94 ± 10.17 | 422.61 ± 11.06 | 420.14 ± 10.79 | 391.72 ± 9.85 |
| CC | 300.48 ± 10.64 | 295.44 ± 10.55 | 318.91 ± 11.48 | 322.48 ± 11.20 | 304.60 ± 10.13 |
| P value | <.0001 | <.0001 | <.0001 | <.0001 | <.0001 |
| Distal | |||||
| AV | 344.30 ± 9.20 | 422.85 ± 10.51 | 385.22 ± 10.10 | 395.52 ± 10.57 | 385.93 ± 9.47 |
| CC | 284.31 ± 9.46 | 331.42 ± 10.81 | 282.11 ± 10.38 | 289.55 ± 10.87 | 298.90 ± 9.74 |
| P value | <.0001 | <.0001 | <.0001 | <.0001 | <.0001 |
| Tibia | |||||
| Proximal | |||||
| AV | 567.69 ± 31.23 | 589.16 ± 10.05 | 601.41 ± 10.85 | 557.46 ± 11.35 | 575.90 ± 9.99 |
| CC | 594.41 ± 31.23 | 571.07 ± 10.05 | 591.11 ± 10.85 | 569.89 ± 11.35 | 571.22 ± 10.03 |
| P value | 0.5449 | 0.2037 | 0.5021 | 0.4385 | 0.7409 |
| Mid | |||||
| AV | 639.40 ± 12.80 | 655.86 ± 12.83 | 663.15 ± 33.76 | 632.14 ± 12.36 | 643.22 ± 12.19 |
| CC | 605.09 ± 12.80 | 617.84 ± 2.83 | 657.69 ± 33.76 | 602.55 ± 12.36 | 609.45 ± 12.30 |
| P value | 0.0594 | 0.0373 | 0.909 | 0.0919 | 0.0524 |
| Distal | |||||
| AV | 668.92 ± 13.29 | 605.15 ± 12.54 | 559.69 ± 12.02 | 590.98 ± 11.77 | 612.06 ± 11.90 |
| CC | 615.33 ± 13.29 | 574.85 ± 12.54 | 519.21 ± 12.02 | 545.93 ± 11.77 | 571.64 ± 11.96 |
| P value | 0.0048 | 0.0889 | 0.0181 | 0.0073 | 0.0174 |
1
AV = aviary system; CC = conventional cages.
2
Values are presented as least-squares mean ± standard error of the mean.