Journal of experimental zoology. Part A, Ecological genetics and physiology.
Discontinued
Publisher:
John Wiley & Sons, Inc.
Frequency: Monthly
Country: United States
Language: English
Start Year:2007 - 2017
Identifiers
| ISSN: | 1932-5223 (Print) 1932-5231 (Electronic) 1932-5223 (Linking) |
| NLM ID: | 101297745 |
| (OCoLC): | 70638227 |
| LCCN: | 2006214524 |
| Classification: | W1 JO644Y5 |
Comparison of the morphology of the limbs of juvenile and adult horses (Equus caballus) and their implications on the locomotor biomechanics. We analyzed the morphology and the walk-trot and trot-gallop transition velocities of nine juvenile horses and compared them with their mothers. We also compared the relative stride length and the duty factor of the juveniles with respect to adults at three equivalent trotting speeds (Froude numbers 0.5, 0.75, and 1.0), to determine dynamic similarity. Juveniles had a negative allometry in their leg bones, mainly because of little size changes of the distal portions. The negative allometry of extremities allows juveniles to increase stride length without increasing step frequency, which can be...
Masticatory motor patterns in ungulates: a quantitative assessment of jaw-muscle coordination in goats, alpacas and horses. We investigated patterns of jaw-muscle coordination during rhythmic mastication in three species of ungulates displaying the marked transverse jaw movements typical of many large mammalian herbivores. In order to quantify consistent motor patterns during chewing, electromyograms were recorded from the superficial masseter, deep masseter, posterior temporalis and medial pterygoid muscles of goats, alpacas and horses. Timing differences between muscle pairs were evaluated in the context of an evolutionary model of jaw-muscle function. In this model, the closing and food reduction phases of masti...