A 60:40 split: Differential mass support in dogs
| Autor: | Kelsey A. Tennett, Frank E. Fish, Maura J. Sheehan, William T. Gough, Danielle S. Adams |
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| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Histology Posture Hindlimb Grand mean Weight-Bearing 03 medical and health sciences 0302 clinical medicine Animal science Dogs European origin Species Specificity Animals Body Size Ecology Evolution Behavior and Systematics biology Mass distribution Significant difference Terrestrial locomotion biology.organism_classification Breed Biomechanical Phenomena 030104 developmental biology Canis Anatomy 030217 neurology & neurosurgery Locomotion Biotechnology |
| Zdroj: | Anatomical record (Hoboken, N.J. : 2007)REFERENCES. 304(1) |
| ISSN: | 1932-8494 |
| Popis: | Dogs have been bred for different sizes and functions, which can affect their locomotor biomechanics. As quadrupeds, dogs must distribute their mass between fore and hind legs when standing. The mass distribution in dogs was studied to determine if the proportion of supported mass on each limb couplet is dependent on body size. A total of 552 dogs from 123 breeds ranging in size from Chihuahua to Mastiff were examined. Each dog was weighed on a digital scale while standing, alternating foreleg, and hind leg support. The overall "grand" mean proportion of mass on the forelegs to the total mass was 60.4% (range: 47.6-74.4%). The data set indicated no significant change in the ratio with total mass but there was a significant difference by sex. When separated into American Kennel Club categories, no group was notably different from the grand mean or from each other, but when sex was also considered, there was a significant difference that was not specifically discerned by post hoc analysis. The mean for female Hounds was notably below the grand mean. For clades based on genetics, the mean for European origin mastiffs was notably greater than the grand mean and significantly different from UK origin herders and coursers. The mass of the head, chest, and musculature for propulsion could explain the mass support differential. Mass distribution and terrestrial locomotion in dogs shows substantial variation among breeds. |
| Databáze: | OpenAIRE |
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