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| Author | Ramsden, S.; Richardson, F.M.; Josse, G.; Thomas, M.S.C.; Ellis, C.; Shakeshaft, C.; Seghier, M.L.; Price, C.J. | ||||
| Title | Verbal and non-verbal intelligence changes in the teenage brain | Type | Journal Article | ||
| Year | 2011 | Publication | Abbreviated Journal | Nature | |
| Volume | advance online publication | Issue  |
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| Abstract | Intelligence quotient (IQ) is a standardized measure of human intellectual capacity that takes into account a wide range of cognitive skills1. IQ is generally considered to be stable across the lifespan, with scores at one time point used to predict educational achievement and employment prospects in later years1. Neuroimaging allows us to test whether unexpected longitudinal fluctuations in measured IQ are related to brain development. Here we show that verbal and non-verbal IQ can rise or fall in the teenage years, with these changes in performance validated by their close correlation with changes in local brain structure. A combination of structural and functional imaging showed that verbal IQ changed with grey matter in a region that was activated by speech, whereas non-verbal IQ changed with grey matter in a region that was activated by finger movements. By using longitudinal assessments of the same individuals, we obviated the many sources of variation in brain structure that confound cross-sectional studies. This allowed us to dissociate neural markers for the two types of IQ and to show that general verbal and non-verbal abilities are closely linked to the sensorimotor skills involved in learning. More generally, our results emphasize the possibility that an individual’s intellectual capacity relative to their peers can decrease or increase in the teenage years. This would be encouraging to those whose intellectual potential may improve, and would be a warning that early achievers may not maintain their potential. | ||||
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| Publisher | Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. | Place of Publication | Editor | ||
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| ISSN | 1476-4687 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | 10.1038/nature10514 | Approved | no | ||
| Call Number | Equine Behaviour @ team @ | Serial | 5422 | ||
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| Author | Erber, R.; Wulf, M.; Aurich, J.; Becker-Birck, M.; Rose-Meierhöfer, S.; Möstl, E.; Hoffmann, G.; Aurich, C. | ||||
| Title | Physiological stress parameters in sport horse mares transferred from group housing to individual stabling | Type | Conference Article | ||
| Year | 2012 | Publication | Proceedings of the 2. International Equine Science Meeting | Abbreviated Journal | Proc. 2. Int. Equine. Sci. Mtg |
| Volume | in press | Issue |
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| Keywords | horse, isolation, cortisol, heart rate, locomotion | ||||
| Abstract | Initial equestrian training and especially first mounting of a rider are stressful challenges for young horses (1). Most young horses are raised in groups but, in association with equestrian training, they are commonly transferred to individual stabling in loose boxes. Although, in most stables, visual contact with horses in adjacent boxes is possible, separation from the herd might be an additional stressor. We have studied physiological stress parameters, in 3-year-old sport horse mares (n=8), transferred from a group stable with access to a paddock to individual boxes without paddock. Once stabled in the individual boxes, mares underwent a standard training for young horses. Horses had been accustomed to lunging and tolerating a rider on their back several weeks before the study. Mares were studied from 5 days before to 5 days after changing the stable. Cortisol concentration in saliva, locomotion activity (ALT pedometers), heart rate (HR) and HR variability (RMSSD: root mean square of successive beat-to-beat intervals) were determined. We hypothesized that the change of the stable increases cortisol release and is associated with changes in HR and RMSSD and reduced locomotion. Before mares were moved to individual boxes, cortisol concentration showed a pronounced diurnal rhythm with values around 0.6 ng/ ml in the morning and a continuous decrease throughout the day. When the mares were moved to individual boxes, cortisol concentration increased to 1.8±0.2 ng/ml and did not return to baseline values within 6 h (p<0.05 over time). On subsequent days, a diurnal rhythm was re-established but shifted to a higher level than before. Locomotion activity determined by ALT pedometers was increased for some minutes only after mares has been placed in individual boxes but was only slightly higher than during the time mares spent with the group in a paddock. On days 2-5 in individual boxes, locomotion activity was reduced compared to the group stable. HR increased and the HRV variable RMSSD decreased when mares were separated. In conclusion, separating horses during initial training from their group is an additional stressor, although the stress is less pronounced than induced by other social challenges, e.g. weaning of foals (2). When stabled in individual boxes, mares move less than when kept as a group. Horses kept in a group thus appear to exercise themselves freely, such an effect is absent when the animals are kept individually. | ||||
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| Corporate Author | Erber, R. | Thesis | |||
| Publisher | Xenophon Publishing | Place of Publication | Wald | Editor | Krueger, K. |
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| ISSN | 978-3-9808134-26 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5542 | ||
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| Author | Schneider, G.; Krueger, K. | ||||
| Title | Third-party intervention | Type | Conference Article | ||
| Year | 2012 | Publication | Proceedings of the 2. International Equine Science Meeting | Abbreviated Journal | Proc. 2. Int. Equine. Sci. Mtg |
| Volume | Issue |
Pages | 73 | ||
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| Abstract | Third-party intervention is the interruption of a dyadic interaction by a third animal. We observed such interventions in affiliative interactions in free-ranging Esperia-ponies (Equus caballus). It is known that horses intervene in affiliative contexts especially when a preferred partner is involved, probably to protect their social bond to this preferred partner. To prove this hypothesis the present study investigated whether the preferred partner was targeted, i.e. challenged, or supported by the intervener or both randomly. Therefore we examined the social relationship between the intervener and both dyadic interacting individuals. We found that interveners usually supported individuals to which they have stronger social bonds than to other group mates, while they have no particular relationship to the targeted animals. This indicates that interveners in stable horse groups protect their social bonds to the supported animals by challenging their interaction partners. Of all observed horses only some mares showed intervention behaviour. Their social position, reflected by their position in the dominance hierarchy, social networks, and the spatial group structure were investigated. We found that interveners occupy no unique position, but they are involved in a high amount of affiliative interactions, high-ranking, and relatively aggressive. KW - | ||||
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| Corporate Author | Krueger, K. | Thesis | |||
| Publisher | Xenophon Publishing | Place of Publication | Wald | Editor | |
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| ISSN | 978-3-9808134-26 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5549 | ||
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| Author | Hillgruber, F.; Zipf, G. | ||||
| Title | Humans and Horses 300.000 years ago – An approach to public presentation in the research and experience centre Schöningen spears | Type | Conference Article | ||
| Year | 2012 | Publication | Proceedings of the 2. International Equine Science Meeting | Abbreviated Journal | Proc. 2. Int. Equine. Sci. Mtg |
| Volume | in press | Issue |
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| Abstract | We are introducing a new research and experience center located near the stripmine of Schöningen in western Germany, one of the most important archaeological sites in the world, which is scheduled to open its doors in 2013. The 1995 discovery of wooden hunting spears (Thieme 1997) in conjunction with the remains of hunted and butchered horses (Equus mosbachensis) contributed significantly to change the scientific view of early European Hominids being “marginal scavengers” (Binford 1981, Gamble 1987) to skilled hunters. The remains of at least 19 horses were unearthed along a former lakeshore. Initial publications demonstrate early hominid butchery systematics designed to achieve a thorough acquisition of horse products (Voormolen 2008). In order to get a better understanding of the possible hunting scenario (Thieme 2007) knowledge of wild horse behaviour is of primary interest. The exhibit section of the new center is developed to present an experience oriented concept. Access to artefacts, such as the over 300.000 year old spears, is correlated with exhibits concerning Pleistocene horse morphology, group structure and behaviour of modern day wild horses in order to draw a vivid image of the past | ||||
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| Corporate Author | Hillgruber, F. | Thesis | |||
| Publisher | Xenophon Publishing | Place of Publication | Wald | Editor | Krueger, K. |
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| ISSN | 978-3-9808134-26 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5563 | ||
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| Author | Warmuth, V.; Eriksson, A.; Bower, M.A.; Barker, G.; Barrett, E.; Hanks, B.K.; Li, S.; Lomitashvili, D.; Ochir-Goryaeva, M.; Sizonov, G.V.; Soyonov, V.; Manica, A. | ||||
| Title | Reconstructing the origin and spread of horse domestication in the Eurasian steppe | Type | Journal Article | ||
| Year | 2012 | Publication | Proceedings of the National Academy of Sciences | Abbreviated Journal | Proc Natl Acad Sci U S A |
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| Abstract | Despite decades of research across multiple disciplines, the early history of horse domestication remains poorly understood. On the basis of current evidence from archaeology, mitochondrial DNA, and Y-chromosomal sequencing, a number of different domestication scenarios have been proposed, ranging from the spread of domestic horses out of a restricted primary area of domestication to the domestication of numerous distinct wild horse populations. In this paper, we reconstruct both the population genetic structure of the extinct wild progenitor of domestic horses, Equus ferus, and the origin and spread of horse domestication in the Eurasian steppes by fitting a spatially explicit stepping-stone model to genotype data from >300 horses sampled across northern Eurasia. We find strong evidence for an expansion of E. ferus out of eastern Eurasia about 160 kya, likely reflecting the colonization of Eurasia by this species. Our best-fitting scenario further suggests that horse domestication originated in the western part of the Eurasian steppe and that domestic herds were repeatedly restocked with local wild horses as they spread out of this area. By showing that horse domestication was initiated in the western Eurasian steppe and that the spread of domestic herds across Eurasia involved extensive introgression from the wild, the scenario of horse domestication proposed here unites evidence from archaeology, mitochondrial DNA, and Y-chromosomal DNA. | ||||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5612 | ||
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| Author | Hoffmann; G. | ||||
| Title | Bewegungsaktivität und Stressbelastung bei Pferden in Auslaufhaltungssystemen mit verschiedenen Bewegungsangeboten | Type | Manuscript | ||
| Year | 2008 | Publication | Dissertation | Abbreviated Journal | |
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| Abstract | Pferdehaltungssysteme mit angrenzenden Ausläufen gelten als eine sehr tiergerechte Haltungsform, da sie den Tieren eine gewisse Bewegungsmöglichkeit bieten. Ziel der vorliegenden Untersuchung war es, zu erfassen, ob der angrenzende Auslauf selbst einen ausreichenden Anreiz zur Bewegung darstellt und wie sich verschiedene Bewegungs- und Platzangebote auf die Bewegungsaktivität von Pferden in einer Gruppen-Auslaufhaltung auswirken. Zudem wurde ermittelt, welche Auswirkung die Bewegungsform bzw. –intensität auf das Wohlbefinden der Tiere hat. Der Großteil der in Deutschland gehaltenen Pferde verbringt die meiste Zeit des Tages im Stall, obwohl mittlerweile bekannt ist, dass Pferde unter natürlichen Haltungsbedingungen 12 bis 16 Stunden des Tages in Bewegung verbringen. Der Optimierung der Stallhaltungssysteme gilt daher ein besonderes Interesse. Zu diesem Zweck wurden von September 2004 bis Oktober 2005 Versuche mit 24 Warmblutstuten im Alter von 1½ bis 3½ Jahren in Einzel- und Gruppen- Auslaufhaltungssystemen durchgeführt. Jeweils sechs Pferde bildeten eine Versuchsgruppe. In jeder Gruppe fanden fünf Varianten von einer ca. dreiwöchigen Dauer statt. Die Gruppenhaltung wurde dabei durch drei unterschiedliche Zusatzbewegungsangebote (2 Std. Weide / Tag, 2 Std. unbegrünte Koppel / Tag, 1 Std. Freilauf- Führanlage / Tag) ergänzt. In der Einzel-Auslaufhaltung (Box mit 45 m²-großem angrenzenden Auslauf) und in einer Versuchsvariante der Gruppenhaltung bekamen die Pferde hingegen keine zusätzliche Bewegung außerhalb des Stallhaltungssystems angeboten. Das Gruppenhaltungssystem selbst war durch die räumliche Trennung der Funktionsbereiche (Liegen, Fressen, Trinken, Bewegen) gekennzeichnet und der angrenzende Auslauf war 270 m² groß. In einer zusätzlichen Versuchsphase fand in der Gruppenhaltung eine Erweiterung des permanent zugänglichen Auslaufs auf insg. 540 m² statt. Die Bewegungsaktivität wurde mit Pedometern erfasst, die an jeweils einem Hinterbein der Pferde befestigt wurden und ergänzend fand eine Analyse von Videoaufzeichnungen statt. Zur Beurteilung der Stressbelastung fanden Messungen der Herz192 Zusammenfassung frequenzvariabilität (Parameter HF und SD2) und der fäkalen Cortisolmetabolitenkonzentration statt. Die Auswertung des Bewegungsverhaltens ergab, dass eine zusätzliche zweistündige freie Bewegung der Pferdegruppe auf einer Weide zu einer deutlichen Steigerung der durchschnittlichen Bewegungsaktivität (149,6 Min. / Tag) führt, ebenso wie eine einstündige Bewegung in einer Führanlage (173,0 Min. / Tag). Eine unbegrünte Koppel regte die Pferde der Gruppenhaltung hingegen nicht zu vermehrter Bewegung an (131,6 Min. / Tag), sondern bewirkte z. T. sogar eine Abnahme der Bewegungsaktivität. In der Gruppen-Auslaufhaltung ohne zusätzliches Bewegungsangebot war die Bewegungsaktivität ebenfalls gering (125,8 Min / Tag) und während der Einzel-Auslaufhaltung ohne Zusatzbewegung zeigten die Pferde die geringste Bewegungsaktivität (102,3 Min. / Tag). Bei der alleinigen Analyse der Bewegungszeit im Stallhaltungssystem war kein signifikanter Einfluss der zusätzlichen Bewegung außerhalb des Stallsystems auf die übrige Fortbewegung feststellbar. Auch eine Vergrößerung des an den Stall angrenzenden Auslaufs im Gruppenhaltungssystem hatte keinen steigernden Einfluss auf das Bewegungsverhalten der Pferde. Die Stressbelastung der Pferde war in den Varianten der Gruppenhaltung mit zweistündigem Weidegang (SD2: 82,9 ms; Cortisolmetaboliten: 29,0 nmol / kg Kot) sowie der einstündigen Bewegung in einer Freilauf-Führanlage (SD2: 99,2 ms; Cortisolmetaboliten: 27,7 nmol / kg Kot) am geringsten. Die Untersuchungen zeigten eine Stresszunahme in der Gruppenhaltung mit zweistündigem Auslauf auf einer unbegrünten Koppel ohne Futterangebot (SD2: 101,3 ms; Cortisolmetaboliten: 39,6 nmol / kg Kot) sowie in der Variante der Gruppenhaltung ohne zusätzliches Bewegungsangebot (SD2: 113,3 ms; Cortisolmetaboliten: 38,4 nmol / kg Kot). Dem Mittelwert der Gruppe nach zu folgern hatten die Pferde während der Einzelhaltung ohne Zusatzbewegung eine sehr große Stressbelastung (SD2: 123,8 ms; Cortisolmetaboliten: 37,5 nmol / kg Kot). Ein Vergleich der Gruppen- und Einzelhaltung hinsichtlich der Herzfrequenzvariabilität hat jedoch gezeigt, dass insg. 70 % der Pferde während der Haltung in einer Gruppe weniger Stress empfinden. Es gab aber auch Zusammenfassung 193 Pferde (30 %), die in der Einzelhaltung eine abnehmende Stressbelastung zeigten, wobei hier der Einfluss der Rangordnung eine entscheidende Rolle zu spielen scheint. Durch die Auswertung mehrerer Messparameter (sowohl für Stress- als auch für Bewegungsverhalten) werden gleichgerichtete Tendenzen bei den Versuchsvarianten deutlich, allerdings ist eine eindeutige Gewichtung der Parameter nicht möglich. Somit ist die methodische Vorgehensweise dieser Untersuchung sehr positiv und als notwendig anzusehen, da die Messdaten auch immer gewissen Schwankungen durch externe Einflüsse unterliegen. Allgemein ist festzuhalten, dass Auslaufhaltungssysteme zwar eine gewisse Anregung zur Bewegung bieten, aber mit maximal vier Stunden (insg. 62 – 248 Min.) Bewegung pro Tag war der tägliche Anteil an Bewegung sehr viel geringer als beispielsweise bei Pferden in freier Wildbahn oder ganzjähriger Weidehaltung. Somit deckt ein Auslaufhaltungssystem trotz getrennter Funktionsbereiche und eines großen Auslaufs nicht den Bewegungsbedarf der Pferde, wenn keine zusätzlichen Bewegungsanreize und –möglichkeiten angeboten werden. Eine zusätzliche Bewegung von Pferden ist nicht nur zur Gesunderhaltung des Bewegungsapparates und der Körperfunktionen notwendig, sondern auch um das Wohlbefinden und die Ausgeglichenheit der Pferde zu steigern. [Horse husbandry systems with close-by discharge are considered to be a very livestock- friendly housing form, as they offer a certain movement opportunity for the animals. The aim of the present study was to examine how different movement and space offerings affect the movement activities of horses in a group horse husbandry with close-by discharge, and whether the discharge provides itself an adequate incentive for movement. The impact that the form or rather intensity of movement has on the wellbeing of the animals was also established. Most of the horses held in Germany spend most of the day in the stable, although it is meanwhile known that horses under natural housing conditions are 12 to 16 hours of the day in motion. Therefore the improvement of stable housing systems applies a special interest. For this purpose, 24 warmblood mares, aged from 1½ to 3½ years, were studied in single and group discharge husbandry systems from September 2004 until October 2005. Six horses formed an experimental group. In every group five variants of approximately three weeks were proceeded. Thereby the group husbandry was supplemented with three different additional movement opportunities (2 h pasture / day, 2 h non-grassy pasture land / day, 1 h free range horse walker / day). In the single discharge husbandry (single box with 45 sq. m-large close-by discharge) and in one experimental variant of the group husbandry got the horses, however, offered no additional movement outside the husbandry system. The group husbandry system itself was marked by the spatial division of the functional areas (lying, eating, drinking, moving) and the close-by discharge measured 270 sq. m. In an additional phase of the study, and expansion of the permanently accessible close-by discharge to 540 sq. m was found. The movement activity was documented with pedometers attached respectively to one hind leg of the horse and a supplementary analysis of video documentation. To evaluate the stress exposure measurements of heart frequency variability (parameters HF and SD2) and of the faecal cortisol metabolite concentration were performed. Summary 195 The interpretation of the movement behaviour showed that additional two hours of free movement on a pasture led to a significant increase in the average movement activity (149.6 min / day), as well as one hour movement in a horsewalker did (173.0 min / day). The non-grassy pasture land, however, didn’t inspire the horses of the group husbandry to increased movement (131.6 min / day), but sometimes even caused a decrease in movement activity. In the group discharge husbandry without additional movement opportunities the movement activity was also low (125.8 min / day), and during the single discharge husbandry without additional movement the horses showed the least movement activity (102.3 min / day). In analysing only the movement time in the stable system was no significant impact of the additional movement outside the housing system to the rest of locomotion ascertainable. As well an expansion of the close-by stable discharge in the group husbandry system had no increasing influence on the movement behaviour of the horses. The stress exposure of the horses was least in the variations of group husbandry with two hours on a pasture (SD2: 82.9 ms; cortisol metabolites: 29.0 nmol / kg faeces) as well as one hour of movement in a free range horse walker (SD2: 99.2 ms; cortisol metabolites: 27.7 nmol / kg faeces). The studies showed a rise in stress in group husbandry with two hours of movement on a non-grassy pasture land without feeding opportunity (SD2: 101.3 ms; cortisol metabolites: 39.6 nmol / kg faeces) as well as in the variation of the group husbandry without additional movement offerings (SD2: 113.3 ms; cortisol metabolites: 38.4 nmol / kg faeces). Judging from the mean of the group the horses had a very high stress exposure in the variation of the single husbandry without additional movement offerings (SD2: 123.8 ms; cortisol metabolites: 37.5 nmol / kg faeces). But a comparison of the group and single husbandry in terms of the heart frequency variability showed that alltogether 70 % of the horses experienced less stress if hold in a group. However, some horses (30 %) showed reducing stress in the single husbandry, whereas here the influence of social hierarchy seems to play a decisive role. 196 Summary In consequence of the examination of several measuring parameters (both for stressand for movement behaviour) parallel aligned tendencies become apparent in the experimental variants, however, is a unique weighting of the parameters not possible. Thus, the methodological approach of this study is to be regarde as very positive and necessary, since the data always vary with some fluctuations by external influences. In general it can be established that discharge husbandry systems offer some incentive for the horse to move, but with a maximum of four hours (overall 62 – 248 min) of movement per day, the daily proportion of movement was much less than, for example, in the case of wild horses or year-round pasture keeping. Thus, if no additional movement incentives and possibilities are offered, the discharge husbandry system doesn’t cover the movement needs of the horse despite separate functional areas and a large outside discharge. Additional movement is not only necessary to keep the musculoskeletal system and bodily functions of the horse healthy, but also to ensure the horse’s well being and mental balance.] |
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| Call Number | Equine Behaviour @ team @ | Serial | 5660 | ||
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| Author | Sebilo, M.; Mayer, B.; Nicolardot, B.; Pinay, G.; Mariotti, A. | ||||
| Title | Long-term fate of nitrate fertilizer in agricultural soils | Type | Journal Article | ||
| Year | 2013 | Publication | Proceedings of the National Academy of Sciences | Abbreviated Journal | PNAS |
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| Abstract | Increasing diffuse nitrate loading of surface waters and groundwater has emerged as a major problem in many agricultural areas of the world, resulting in contamination of drinking water resources in aquifers as well as eutrophication of freshwaters and coastal marine ecosystems. Although empirical correlations between application rates of N fertilizers to agricultural soils and nitrate contamination of adjacent hydrological systems have been demonstrated, the transit times of fertilizer N in the pedosphere–hydrosphere system are poorly understood. We investigated the fate of isotopically labeled nitrogen fertilizers in a three–decade-long in situ tracer experiment that quantified not only fertilizer N uptake by plants and retention in soils, but also determined to which extent and over which time periods fertilizer N stored in soil organic matter is rereleased for either uptake in crops or export into the hydrosphere. We found that 61–65% of the applied fertilizers N were taken up by plants, whereas 12–15% of the labeled fertilizer N were still residing in the soil organic matter more than a quarter century after tracer application. Between 8–12% of the applied fertilizer had leaked toward the hydrosphere during the 30-y observation period. We predict that additional exports of 15N-labeled nitrate from the tracer application in 1982 toward the hydrosphere will continue for at least another five decades. Therefore, attempts to reduce agricultural nitrate contamination of aquatic systems must consider the long-term legacy of past applications of synthetic fertilizers in agricultural systems and the nitrogen retention capacity of agricultural soils. | ||||
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| Call Number | Equine Behaviour @ team @ | Serial | 5730 | ||
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| Author | Galef, G.G. Jr. | ||||
| Title | Social learning: promotor or inhibitor of innovation? | Type | Book Chapter | ||
| Year | 2003 | Publication | Animal Intelligence | Abbreviated Journal | |
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| Publisher | Oxford University Press | Place of Publication | Oxford | Editor | Reader, S.M.; Laland, K. N. |
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| Call Number | Equine Behaviour @ team @ | Serial | 5750 | ||
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| Author | Kaplan, G. | ||||
| Title | Social animals and Communication, with special reference to horses | Type | Conference Article | ||
| Year | 2015 | Publication | Proceedings of the 3. International Equine Science Meeting | Abbreviated Journal | Proc. 3. Int. Equine. Sci. Mtg |
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| Corporate Author | Kaplan, G. | Thesis | |||
| Publisher | Xenophon Publishing | Place of Publication | Wald | Editor | Krueger, K. |
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| Series Editor | Series Title | Abbreviated Series Title | Proc. 3. Int. Equine. Sci. Mtg | ||
| Series Volume | in prep | Series Issue | Edition | ||
| ISSN | ISBN | 978-3-95625-000-2 | Medium | ||
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| Call Number | Equine Behaviour @ team @ | Serial | 5796 | ||
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| Author | Kristjansson, T.; Bjornsdottir, S.; Sigurdsson, A.; Andersson, L.S.; Lindgren, G.; Helyar, S.J.; Klonowski, A.M.; Arnason, T. | ||||
| Title | The effect of the ‘Gait keeper’ mutation in the DMRT3 gene on gaiting ability in Icelandic horses | Type | Journal Article | ||
| Year | 2014 | Publication | Journal of Animal Breeding and Genetics | Abbreviated Journal | J. Anim. Breed. Genet. |
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Pages | n/a-n/a | ||
| Keywords | Gaiting ability; genotype effect; genotype probability | ||||
| Abstract | A nonsense mutation in DMRT3 (‘Gait keeper’ mutation) has a predominant effect on gaiting ability in horses, being permissive for the ability to perform lateral gaits and having a favourable effect on speed capacity in trot. The DMRT3 mutant allele (A) has been found in high frequency in gaited breeds and breeds bred for harness racing, while other horse breeds were homozygous for the wild-type allele (C). The aim of this study was to evaluate further the effect of the DMRT3 nonsense mutation on the gait quality and speed capacity in the multigaited Icelandic horse and demonstrate how the frequencies of the A- and C- alleles have changed in the Icelandic horse population in recent decades. It was confirmed that homozygosity for the DMRT3 nonsense mutation relates to the ability to pace. It further had a favourable effect on scores in breeding field tests for the lateral gait tölt, demonstrated by better beat quality, speed capacity and suppleness. Horses with the CA genotype had on the other hand significantly higher scores for walk, trot, canter and gallop, and they performed better beat and suspension in trot and gallop. These results indicate that the AA genotype reinforces the coordination of ipsilateral legs, with the subsequent negative effect on the synchronized movement of diagonal legs compared with the CA genotype. The frequency of the A-allele has increased in recent decades with a corresponding decrease in the frequency of the C-allele. The estimated frequency of the A-allele in the Icelandic horse population in 2012 was 0.94. Selective breeding for lateral gaits in the Icelandic horse population has apparently altered the frequency of DMRT3 genotypes with a predicted loss of the C-allele in relatively few years. The results have practical implications for breeding and training of Icelandic horses and other gaited horse breeds. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1439-0388 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5831 | ||
| Permanent link to this record | |||||