Functional trade-offs in the limb bones of dogs selected for running versus fighting

bluedoglover · Jan 14, 2016

SUMMARY

The physical demands of rapid and economical running differ from the demands of fighting in ways that may prevent the simultaneous evolution of optimal performance in these two behaviors. Here, we test an hypothesis of functional trade-off in limb bones by measuring mechanical properties of limb bones in two breeds of domestic dog (Canis lupus familiaris L.) that have undergone intense artificial selection for running (greyhound) and fighting (pit bull) performance. The bones were loaded to fracture in three-point static bending. To correct for the effect of shear, we estimated the shear stress in the cross section and added energy due to shear stress to the tensile energy. The proximal limb bones of the pit bulls differed from those of the greyhounds in having relatively larger second moments of area of mid-diaphyseal cross sections and in having more circular cross-sectional shape. The pit bulls exhibited lower stresses at yield, had lower elastic moduli and failed at much higher levels of work. The stiffness of the tissue of the humerus, radius, femur and tibia was 1.5-2.4-fold greater in the greyhounds than in the pit bulls. These bones from the pit bulls absorbed 1.9-2.6-fold more energy before failure than did those of the greyhounds. These differences between breeds were not observed in the long bones of the feet, metacarpals and metatarsals. Nevertheless, the results of this analysis suggest that selection for high-speed running is associated with the evolution of relatively stiff, brittle limb bones, whereas selection for fighting performance leads to the evolution of limb bones with relatively high resistance to failure.

Functional trade-offs in the limb bones of dogs selected for running versus fighting | Journal of Experimental Biology
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mind you this study was not done with performance bred dogs. imo the top racing greyhounds should have been used as well as the top game dog,but laws have made that impossible. however studies have been done in the 1800s on irish fighting dogs.

supposedly chinaman as tested at stanford university but i have seen no evidence proving such...

GrChHaunch · Oct 20, 2022

Bump. Bumping because this article concludes that Pit bulls have unusually high tolerance to damage from running (although they cannot run nearly as fast/far as dogs bred for running, like Greyhounds.

This interests me because I am starting my pup on short runs (200 yards) on the concrete. Conventional wisdom is that you should not do much running on concrete until 8 months...but Pit Bull bones are much more robust and resistant to damage than other breeds.

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Functional trade-offs in the limb bones of dogs selected for running versus fighting

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