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Clayton, H.M.; Lanovaz, J.L.; Schamhardt, H.C.; van Wessum, R. |
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Title |
The effects of a rider's mass on ground reaction forces and fetlock kinematics at the trot |
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Journal Article |
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Year |
1999 |
Publication |
Equine Veterinary Journal. Supplement |
Abbreviated Journal |
Equine Vet J Suppl |
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30 |
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218-221 |
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Animals; Body Weight; Computer Simulation; Gait/*physiology; Horses/*physiology; Physical Conditioning, Animal/*physiology; Stress, Mechanical; Weight-Bearing/*physiology |
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Ground reaction force (GRF) measurements are often normalised to body mass to facilitate inter-individual comparisons. The objective of this study was to explore the effect of a rider on the GRFs and fetlock joint kinematics of trotting horses. The subjects were 5 dressage-trained horses and 3 experienced dressage riders. Ground reaction force measurements and sagittal view videotapes were recorded as the horses trotted at the same velocity in hand (3.49 +/- 0.52 m/s) and with a rider (3.49 +/- 0.46 m/s). Data were time-normalised to stance duration. Ground reaction force measurements were expressed in absolute terms and normalised to the system mass (horse or horse plus rider). All the horses showed changes in the same direction when comparing the ridden condition with the in-hand condition. There was an increase in the absolute peak vertical GRFs of the fore- and hindlimbs with a rider. However, the mass-normalised peak vertical GRFs were lower for the ridden condition, with the peak occurring later in the forelimbs and earlier in the hindlimbs compared with the inhand condition. Maximal fetlock angle and its time of occurrence were similar for the 2 conditions, but the fore fetlock joint was more extended during the later part of the stance phase in ridden horses. The presence of a rider appeared to affect the GRFs and fetlock joint kinematics differently in the fore- and hindlimbs, and the ridden horse did not seem to be equivalent to a proportionately larger horse. This should be considered when normalising for body mass in studies comparing horses in hand and ridden horses. |
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Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing 48824-1314, USA |
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PMID:10659255 |
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Equine Behaviour @ team @ |
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3733 |
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Miller-Butterworth, C.M.; Kaplan, J.R.; Barmada, M.M.; Manuck, S.B.; Ferrell, R.E. |
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Title |
The Serotonin Transporter: Sequence Variation in Macaca fascicularis and its Relationship to Dominance |
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Journal Article |
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Year |
2007 |
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Behav Genet |
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Specific genotypes of the rhesus monkey and human serotonin transporter gene (SERT) promoter region are associated with personality traits and serotonergic activity. However, the most commonly studied promoter polymorphism (5-HTTLPR) is monomorphic in many other monkey species. To date, no systematic search for alternative potentially functional polymorphisms across the remaining coding parts of the gene has been undertaken in other primate species, despite the crucial role SERT plays in modulating serotonergic tone. We investigated whether sequence variation in this gene is associated with social rank and serotonin metabolite (5-HIAA) differences in 524 cynomolgus macaques. Sequence variation and extent of linkage disequilibrium (LD) across the regulatory and coding regions were initially characterized in 92 macaques. The exons and promoter contained 28 polymorphisms, more than double that recorded for human SERT. In further contrast to humans, the macaque SERT showed no significant LD. Potentially functional polymorphisms were genotyped in all animals. No individual variants or haplotypes were significantly associated with social rank or 5-HIAA concentrations; however, certain serotonin transporter diplotypes may modulate acquisition of dominance status. |
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Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, A300 Crabtree Hall, 130 De Soto Street, Pittsburgh, PA, USA, cbutterworth@hgen.pitt.edu |
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0001-8244 |
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PMID:17605101 |
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Equine Behaviour @ team @ |
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4104 |
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Zhang, T.-Y.; Parent, C.; Weaver, I.; Meaney, M.J. |
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Title |
Maternal programming of individual differences in defensive responses in the rat |
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2004 |
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Annals of the New York Academy of Sciences |
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Ann N Y Acad Sci |
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1032 |
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85-103 |
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Adaptation, Biological; Aggression/*physiology; Animals; Evolution; Female; Gene Expression/physiology; Humans; Individuality; *Maternal Behavior; Phenotype; Pregnancy; Prenatal Exposure Delayed Effects; Rats; Stress, Psychological/physiopathology |
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This paper describes the results of a series of studies showing that variations in mother-pup interactions program the development of individual differences in behavioral and endocrine stress responses in the rat. These effects are associated with altered expression of genes in brain regions, such as the amygdala, hippocampus, and hypothalamus, that regulate the expression of stress responses. Studies from evolutionary biology suggest that such “maternal effects” are common and often associated with variations in the quality of the maternal environment. Together these findings suggest an epigenetic process whereby the experience of the mother alters the nature of the parent-offspring interactions and thus the phenotype of the offspring. |
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McGill Program for the Study of Behavior, Genes and Environment, Douglas Hospital Research Centre, Department of Psychiatry, McGill University, 6875 boul. LaSalle, Montreal (Quebec), Canada H4H 1R3 |
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0077-8923 |
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PMID:15677397 |
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Equine Behaviour @ team @ |
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4132 |
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Dalin, G.; Magnusson, L.E.; Thafvelin, B.C. |
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Title |
Retrospective study of hindquarter asymmetry in Standardbred trotters and its correlation with performance |
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Year |
1985 |
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Equine Vet. J. |
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17 |
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292-296 |
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Cited By (since 1996): 8; Export Date: 24 October 2008 |
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Admin @ knut @ |
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4579 |
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Ripple, W.J.; Estes, J.A.; Beschta, R.L.; Wilmers, C.C.; Ritchie, E.G.; Hebblewhite, M. |
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Status and ecological effects of the world's largest carnivores |
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2014 |
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Science |
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343 |
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Equine Behaviour @ team @ Ripple2014 |
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6445 |
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Chapron, G.; Kaczensky, P.; Linnell, J.D.C.; Arx, M.; Huber, D.; Andrén, H. |
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Recovery of large carnivores in Europe's modern human-dominated landscapes |
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2014 |
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Science |
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346 |
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Equine Behaviour @ team @ Chapron2014 |
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6451 |
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Blanco, J.C.; Yolanda, C. |
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Surveying wolves without snow: a critical review of the methods used in Spain. Hystrix |
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2012 |
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Ital J Mammal |
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23 |
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Equine Behaviour @ team @ Blanco2012 |
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6460 |
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Author |
Dugnol, B.; Fernández, C.; Galiano, G. |
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Wolf population counting by spectrogram image processing |
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2007 |
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Appl Math Comput |
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186 |
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Equine Behaviour @ team @ Dugnol2007 |
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6464 |
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Author |
Dugnol, B.; Fernández, C.; Galiano, G.; Velasco, J. |
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Implementation of a diffusive differential reassignment method for signal enhancement: An application to wolf population counting |
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2007 |
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Appl Math Comput |
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193 |
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Equine Behaviour @ team @ Dugnol2007 |
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6465 |
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Dugnol, B.; Fernández, C.; Galiano, G.; Velasco, J. |
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On a chirplet transform-based method applied to separating and counting wolf howls |
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2008 |
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Signal Process |
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88 |
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Equine Behaviour @ team @ Dugnol2008 |
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6466 |
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