Non-damaged keel bones.

<p>Absolute numbers and modelled % of birds with a non-damaged keel bone over the course of the experiment for each of the four perch type by genetic line combinations.</p

Model output for the likelihood of keel bone fractures occurring.

<p>^† For this analysis, the category in the `Ref`column serves as the reference from which the other category is compared against (Hybird ISA vs. DW; Perch type soft vs. hard).</p><p>Model output for the likelihood of keel bone fractures occurring.</p

Model output for the likelihood of non-damaged keel bones occurring.

<p>^†For this analysis, the category in the `Ref`column serves as the reference from which the other category is compared against (Hybird ISA vs. DW; Perch type soft vs. hard).</p><p>Model output for the likelihood of non-damaged keel bones occurring.</p

Schematic side view of aviary system Bolegg Terrace.

<p>Schematic side view of aviary system Bolegg Terrace.</p

Production data for genetic line (DW/ ISA) and perch type (hard/ soft), N = 20.

<p>Production data for genetic line (DW/ ISA) and perch type (hard/ soft), N = 20.</p