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| Author | Devenport, J.A.; Patterson, M.R.; Devenport, L.D. | ||||
| Title | Dynamic averaging and foraging decisions in horses (Equus callabus) | Type | Journal Article | ||
| Year | 2005 | Publication | Journal of Comparative psychology | Abbreviated Journal | J. Comp. Psychol. |
| Volume | 119 | Issue | 3 | Pages | 352-358 |
| Keywords | Animals; *Decision Making; *Feeding Behavior; Female; Horses/*psychology; Male; *Memory, Short-Term; Motivation; Orientation; *Social Environment | ||||
| Abstract | The variability of most environments taxes foraging decisions by increasing the uncertainty of the information available. One solution to the problem is to use dynamic averaging, as do some granivores and carnivores. Arguably, the same strategy could be useful for grazing herbivores, even though their food renews and is more homogeneously distributed. Horses (Equus callabus) were given choices between variable patches after short or long delays. When patch information was current, horses returned to the patch that was recently best, whereas those without current information matched choices to the long-term average values of the patches. These results demonstrate that a grazing species uses dynamic averaging and indicate that, like granivores and carnivores, they can use temporal weighting to optimize foraging decisions. | ||||
| Address | Department of Psychology, University of Central Oklahoma, 73034, USA. jdevenport@ucok.edu | ||||
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| Language | English | Summary Language | Original Title | ||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0735-7036 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | PMID:16131264 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 752 | ||
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| Author | Murray, J.K.; Singer, E.R.; Morgan, K.L.; Proudman, C.J.; French, N.P. | ||||
| Title | Risk factors for cross-country horse falls at one-day events and at two-/three-day events | Type | Journal Article | ||
| Year | 2005 | Publication | The Veterinary Journal | Abbreviated Journal | |
| Volume | 170 | Issue | 3 | Pages | 318-324 |
| Keywords | Horse; Eventing; Fall; Cross-country; Risk | ||||
| Abstract | The cross-country phase of eventing competitions has been associated with injuries and fatalities to horses and riders. A case-control study was carried out to identify variables that were associated with increased or decreased risk of a horse fall on the cross-country phase at event competitions. After initial analysis, the dataset was split according to the categories of one-day events as compared to two- or three-day events to establish whether significant risk factors varied between the different types of eventing competitions. Data were collected for 121 cases (horse falls) at one-day events, 59 cases at two- or three-day events and for their 540 matched controls. The data were analysed using conditional logistic regression. The variables of no previous refusals on the course, fences with a landing in water and the combined variable of the angle and the spread of the fence were significantly associated with the risk of a horse fall in both datasets. Additional risk factors for one-day event falls were: fences requiring a take-off from water, a drop landing, the rider's knowledge of their position before the cross-country phase and if the rider received cross-country tuition. Three-day event risk factors in the multivariable model included: the camber of the fence and participation in non-equestrian sports by the rider. This study identified variables that were significantly associated with an increase or a decrease in the risk of a horse fall during the cross-country phase of different types of eventing competitions. Some of these variables are modifiable and the results of this study have been reported to the governing body of the sport of eventing in the UK so that possible interventions might be considered. | ||||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 3671 | ||
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| Author | Hodgson, D.; Howe, S.; Jeffcott, L.; Reid, S.; Mellor, D.; Higgins, A. | ||||
| Title | Effect of prolonged use of altrenogest on behaviour in mares | Type | |||
| Year | 2005 | Publication | Veterinary journal (London, England : 1997) | Abbreviated Journal | Vet J |
| Volume | 169 | Issue | 1 | Pages | 113-115 |
| Keywords | Administration, Oral; Anabolic Agents/adverse effects/*pharmacology; Animals; Behavior, Animal/*drug effects; Body Constitution/drug effects; Body Weight/drug effects; *Doping in Sports; Female; Horses/*physiology; Social Behavior; Social Dominance; Time Factors; Trenbolone/adverse effects/*analogs & derivatives/*pharmacology | ||||
| Abstract | Erratum in: Vet J. 2005 May;169(3):321. Corrected and republished in: Vet J. 2005 May;169(3):322-5. Oral administration of altrenogest for oestrus suppression in competition horses is believed to be widespread in some equestrian disciplines, and can be administered continuously for several months during a competition season. To examine whether altrenogest has any anabolic or other potential performance enhancing properties that may give a horse an unfair advantage, we examined the effect of oral altrenogest (0.044 mg/kg), given daily for a period of eight weeks, on social hierarchy, activity budget, body-mass and body condition score of 12 sedentary mares. We concluded that prolonged oral administration of altrenogest at recommended dose rates to sedentary mares resulted in no effect on dominance hierarchies, body mass or condition score. |
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| Address | Faculty of Veterinary Science, University of Sydney, Private Mailbag 4, Narellan Delivery Centre, Narellan, NSW 2567, Australia. davidh@camden.usyd.edu.au | ||||
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| Language | English | Summary Language | Original Title | ||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1090-0233 | ISBN | Medium | ||
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| Notes | PMID:15683772 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 671 | ||
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| Author | Dall, S.R.X.; Giraldeau, L.-A.; Olsson, O.; McNamara, J.M.; Stephens, D.W. | ||||
| Title | Information and its use by animals in evolutionary ecology | Type | Journal Article | ||
| Year | 2005 | Publication | Trends in Ecology & Evolution (Personal Edition) | Abbreviated Journal | Trends Ecol Evol |
| Volume | 20 | Issue | 4 | Pages | 187-193 |
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| Abstract | Information is a crucial currency for animals from both a behavioural and evolutionary perspective. Adaptive behaviour relies upon accurate estimation of relevant ecological parameters; the better informed an individual, the better it can develop and adjust its behaviour to meet the demands of a variable world. Here, we focus on the burgeoning interest in the impact of ecological uncertainty on adaptation, and the means by which it can be reduced by gathering information, from both 'passive' and 'responsive' sources. Our overview demonstrates the value of adopting an explicitly informational approach, and highlights the components that one needs to develop useful approaches to studying information use by animals. We propose a quantitative framework, based on statistical decision theory, for analysing animal information use in evolutionary ecology. Our purpose is to promote an integrative approach to studying information use by animals, which is itself integral to adaptive animal behaviour and organismal biology. | ||||
| Address | Centre for Ecology and Conservation, University of Exeter in Cornwall, Tremough Campus, Penryn, UK, TR10 9EZ. sashadall@iname.com | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0169-5347 | ISBN | Medium | ||
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| Notes | PMID:16701367 | Approved | no | ||
| Call Number | Serial | 2128 | |||
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| Author | Hare, B.; Tomasello, M. | ||||
| Title | Human-like social skills in dogs? | Type | Journal Article | ||
| Year | 2005 | Publication | Trends in Cognitive Sciences | Abbreviated Journal | Trends. Cognit. Sci. |
| Volume | 9 | Issue | 9 | Pages | 439-444 |
| Keywords | *Animal Communication; Animals; *Behavior, Animal; Cognition/*physiology; Dogs; *Evolution; Humans; *Social Behavior | ||||
| Abstract | Domestic dogs are unusually skilled at reading human social and communicative behavior--even more so than our nearest primate relatives. For example, they use human social and communicative behavior (e.g. a pointing gesture) to find hidden food, and they know what the human can and cannot see in various situations. Recent comparisons between canid species suggest that these unusual social skills have a heritable component and initially evolved during domestication as a result of selection on systems mediating fear and aggression towards humans. Differences in chimpanzee and human temperament suggest that a similar process may have been an important catalyst leading to the evolution of unusual social skills in our own species. The study of convergent evolution provides an exciting opportunity to gain further insights into the evolutionary processes leading to human-like forms of cooperation and communication. | ||||
| Address | Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, Leipzig, Germany. hare@eva.mpg.de | ||||
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| Language | English | Summary Language | Original Title | ||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1364-6613 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | PMID:16061417 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 546 | ||
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| Author | Seyfarth, R.M.; Cheney, D.L.; Bergman, T.J. | ||||
| Title | Primate social cognition and the origins of language | Type | Journal Article | ||
| Year | 2005 | Publication | Trends in Cognitive Sciences | Abbreviated Journal | Trends. Cognit. Sci. |
| Volume | 9 | Issue | 6 | Pages | 264-266 |
| Keywords | Animals; *Cognition; Humans; *Language; Papio; Psychological Theory; Social Behavior; *Social Perception | ||||
| Abstract | Are the cognitive mechanisms underlying language unique, or can similar mechanisms be found in other domains? Recent field experiments demonstrate that baboons' knowledge of their companions' social relationships is based on discrete-valued traits (identity, rank, kinship) that are combined to create a representation of social relations that is hierarchically structured, open-ended, rule-governed, and independent of sensory modality. The mechanisms underlying language might have evolved from the social knowledge of our pre-linguistic primate ancestors. | ||||
| Address | Departments of Biology and Psychology, University of Pennsylvania, Philadelphia, PA 19104, USA. seyfarth@psych.upenn.edu | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 1364-6613 | ISBN | Medium | ||
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| Notes | PMID:15925802 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 343 | ||
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| Author | Gomez, J.-C. | ||||
| Title | Species comparative studies and cognitive development | Type | Journal Article | ||
| Year | 2005 | Publication | Trends in Cognitive Sciences | Abbreviated Journal | Trends. Cognit. Sci. |
| Volume | 9 | Issue | 3 | Pages | 118-125 |
| Keywords | Animals; Attention/physiology; Brain/*growth & development; Child, Preschool; Cognition/*physiology; Concept Formation/physiology; Dogs; Evolution; Fixation, Ocular; Gorilla gorilla; Humans; Infant; Learning/*physiology; Macaca mulatta; Mental Recall/physiology; Personal Construct Theory; Psychomotor Performance/physiology; Species Specificity | ||||
| Abstract | The comparative study of infant development and animal cognition brings to cognitive science the promise of insights into the nature and origins of cognitive skills. In this article, I review a recent wave of comparative studies conducted with similar methodologies and similar theoretical frameworks on how two core components of human cognition--object permanence and gaze following--develop in different species. These comparative findings call for an integration of current competing accounts of developmental change. They further suggest that evolution has produced developmental devices capable at the same time of preserving core adaptive components, and opening themselves up to further adaptive change, not only in interaction with the external environment, but also in interaction with other co-developing cognitive systems. | ||||
| Address | Scottish Primate Research Group, School of Psychology, University of St Andrews, St Andrews, Fife KY15 9JU, UK | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 1364-6613 | ISBN | Medium | ||
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| Notes | PMID:15737820 | Approved | no | ||
| Call Number | Equine Behaviour @ team @ | Serial | 2851 | ||
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| Author | Callow, N.; Waters, A. | ||||
| Title | The effect of kinesthetic imagery on the sport confidence of flat-race horse jockeys | Type | Journal Article | ||
| Year | 2005 | Publication | Psychology of Sport and Exercise | Abbreviated Journal | |
| Volume | 6 | Issue | 4 | Pages | 443-459 |
| Keywords | Vmiq; Miq; Multiple-baseline design; Itsacorr | ||||
| Abstract | Objectives The primary objective was to examine the efficacy of a kinesthetic imagery intervention on the sport confidence of three professional flat-race horse jockeys, with the secondary objective of examining the relationship between performance and sport confidence.Design A multiple-baseline across participants research design was employed.Methods The State Sport Confidence Inventory [SSCI; Vealey, R.S. (1986). Conceptualization of sport confidence and competitive orientation: Preliminary investigation and instrument development. Journal of Sport Psychology, 8, 221-246.] was administered twice weekly, prior to a total of 23, 25, and 27 races for participants 1, 2, and 3, respectively. In addition, performance data were collected on each SSCI data collection day. The kinesthetic imagery intervention consisted of six kinesthetic imagery sessions, twice weekly during a 3-week period. The intervention was introduced after race 7, 9, and 11 for participants 1, 2, and 3, respectively. Approximately, 1 week after the end of the data collection, participants completed a postexperimental questionnaire.Results ITSACORR [Crosbie, J. (1993). Interrupted time-series analysis with brief single-subject data. Journal of Consulting and Clinical Psychology, 6, 966-974.] was employed to analyze the sport confidence data. The results of ITSACORR along with visual inspection, demonstrated a significant increase in sport confidence for participants 1 and 3, and a non-significant increase for participant 2. Kendall's tau b correlations failed to find a significant relationship between performance and confidence.Conclusions The results are discussed in terms of the value of kinesthetic imagery as a tool for athletes to practice and develop. Furthermore, this study demonstrates the ability of ITSACORR to provide a statistical analysis for serially dependent single-subject data. | ||||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 3698 | ||
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| Author | Apfelbach, R.; Blanchard, C.D.; Blanchard, R.J.; Hayes, R.A.; McGregor, I.S. | ||||
| Title | The effects of predator odors in mammalian prey species: A review of field and laboratory studies | Type | Journal Article | ||
| Year | 2005 | Publication | Neuroscience and Biobehavioral Reviews | Abbreviated Journal | |
| Volume | 29 | Issue | 8 | Pages | 1123-1144 |
| Keywords | Behavioral suppression; Defensive behavior; Endocrine effects; Neural effects; Predator odor; Small mammals | ||||
| Abstract | Prey species show specific adaptations that allow recognition, avoidance and defense against predators. For many mammalian species this includes sensitivity towards predator-derived odors. The typical sources of such odors include predator skin and fur, urine, feces and anal gland secretions. Avoidance of predator odors has been observed in many mammalian prey species including rats, mice, voles, deer, rabbits, gophers, hedgehogs, possums and sheep. Field and laboratory studies show that predator odors have distinctive behavioral effects which include (1) inhibition of activity, (2) suppression of non-defensive behaviors such as foraging, feeding and grooming, and (3) shifts to habitats or secure locations where such odors are not present. The repellent effect of predator odors in the field may sometimes be of practical use in the protection of crops and natural resources, although not all attempts at this have been successful. The failure of some studies to obtain repellent effects with predator odors may relate to (1) mismatches between the predator odors and prey species employed, (2) strain and individual differences in sensitivity to predator odors, and (3) the use of predator odors that have low efficacy. In this regard, a small number of recent studies have suggested that skin and fur-derived predator odors may have a more profound lasting effect on prey species than those derived from urine or feces. Predator odors can have powerful effects on the endocrine system including a suppression of testosterone and increased levels of stress hormones such as corticosterone and ACTH. Inhibitory effects of predator odors on reproductive behavior have been demonstrated, and these are particularly prevalent in female rodent species. Pregnant female rodents exposed to predator odors may give birth to smaller litters while exposure to predator odors during early life can hinder normal development. Recent research is starting to uncover the neural circuitry activated by predator odors, leading to hypotheses about how such activation leads to observable effects on reproduction, foraging and feeding. © 2005 Elsevier Ltd. All rights reserved. | ||||
| Address | School of Psychology, University of Sydney, Sydney, NSW 2006, Australia | ||||
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| Call Number | Equine Behaviour @ team @ | Serial | 4565 | ||
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| Author | Hemelrijk, C.K.; Wantia, J. | ||||
| Title | Individual variation by self-organisation | Type | Journal Article | ||
| Year | 2005 | Publication | Neuroscience and biobehavioral reviews | Abbreviated Journal | Neurosci Biobehav Rev |
| Volume | 29 | Issue | 1 | Pages | 125-136 |
| Keywords | Aggression; Animals; Behavior, Animal/*physiology; Competitive Behavior/*physiology; Female; Humans; *Individuality; Male; Models, Psychological; Sex Characteristics; *Social Dominance; Time Factors | ||||
| Abstract | In this paper, we show that differences in dominance and spatial centrality of individuals in a group may arise through self-organisation. Our instrument is a model, called DomWorld, that represents two traits that are often found in animals, namely grouping and competing. In this model individual differences grow under the following conditions: (1) when the intensity of aggression increases and grouping becomes denser, (2) when the degree of sexual dimorphism in fighting power increases. In this case the differences among females compared to males grow too, (3) when, upon encountering another individual, the tendency to attack is 'obligate' and not conditional, namely 'sensitive to risks'. Results resemble phenomena described for societies of primates, mice, birds and pigs. | ||||
| Address | Theoretical Biology, University of Groningen, NN Haren, The Netherlands. hemelrij@ifi.unizh.ch | ||||
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| ISSN | 0149-7634 | ISBN | Medium | ||
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| Notes | PMID:15652260 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 443 | ||
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