Proximal tibiotarsal cancellous bone mechanical properties in broilers
1997
Broiler leg abnormalities cause significant economic losses through decreased body weight gains and
increased mortalities. The mechanical properties of poultry cancellous bone could be contributory factors in lameness
caused by these abnormalities. For example, a decreased elastic modulus indicates that the bone is less resistant to
deformation. In the subchondral growth plate area, decreased deformation resistance could lead to greater incidences of
damage to the growth plate, resulting in morphologic changes causing lameness. The objective of this study was to
examine the effects of age and of altering protein and amino acid nutrition on body weight, bone ash content, and
cancellous bone compressive strength characteristics (strength, elastic modulus, and resilience).
Body weights increased as age increased, regardless of other factors. Bone ash content typically declined by nine
weeks of age. A reduction in strength, elastic modulus, and resilience was seen at nine weeks of age with elastic modulus
in the lateral region of proximal tibiotarsal cancellous bone being the exception. In general, bone ash content directly
affected the measured bone strength parameters, i.e., a decrease in bone strength parameters occurred when bone ash
content decreased.
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