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Author |
Webster, M.M.; Laland, K.N. |
Title |
Social learning strategies and predation risk: minnows copy only when using private information would be costly |
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Journal Article |
Year |
2008 |
Publication |
Proc Biol Sci |
Abbreviated Journal |
Proc. R. Soc. Lond. B |
Volume |
275 |
Issue |
1653 |
Pages |
2869-2876 |
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Abstract |
Animals can acquire information from the environment privately, by sampling it directly, or socially, through learning from others. Generally, private information is more accurate, but expensive to acquire, while social information is cheaper but less reliable. Accordingly, the 'costly information hypothesis' predicts that individuals will use private information when the costs associated with doing so are low, but that they should increasingly use social information as the costs of using private information rise. While consistent with considerable data, this theory has yet to be directly tested in a satisfactory manner. We tested this hypothesis by giving minnows (Phoxinus phoxinus) a choice between socially demonstrated and non-demonstrated prey patches under conditions of low, indirect and high simulated predation risk. Subjects had no experience (experiment 1) or prior private information that conflicted with the social information provided by the demonstrators (experiment 2). In both experiments, subjects spent more time in the demonstrated patch than in the non-demonstrated patch, and in experiment 1 made fewer switches between patches, when risk was high compared with when it was low. These findings are consistent with the predictions of the costly information hypothesis, and imply that minnows adopt a 'copy-when-asocial-learning-is-costly' learning strategy. |
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Equine Behaviour @ team @ |
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6196 |
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Author |
Hoppitt, W.; Laland, K.N. |
Title |
Social processes influencing learning in animals: a review of the evidence |
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Journal Article |
Year |
2008 |
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Adv Study Behav |
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38 |
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105-165 |
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Equine Behaviour @ team @ Hoppitt2008 |
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6260 |
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Langbein, J.; Siebert, K.; Nuernberg, G. |
Title |
Concurrent recall of serially learned visual discrimination problems in dwarf goats (Capra hircus) |
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Journal Article |
Year |
2008 |
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Behav Proc |
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79 |
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Equine Behaviour @ team @ Langbein2008 |
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6363 |
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Visser, E.K.; Ellis, A.D.; Van Reenen, C.G. |
Title |
The effect of two different housing conditions on the welfare of young horses stabled for the first time |
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Journal Article |
Year |
2008 |
Publication |
Applied Animal Behaviour Science |
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Volume |
114 |
Issue |
3 |
Pages |
521-533 |
Keywords |
Horse; Welfare; Stabling; Housing; HPA axis; Novel Object test |
Abstract |
The effect of stabling for the first time on the behaviour and welfare of young and naïve horses has not yet been studied in detail. In this study we examined the effect of two typical housing systems on their subsequent behavioural and physiological responses upon first time stabling. Thirty-six 2-year-old Dutch warmbloods, 18 geldings and 18 mares were included in the study. Half of the horses were stabled in individual stables (10.5m2) and the other half in pair housing (48m2 for two horses). The study lasted 12 weeks. At the end of the study the physiological and temperamental responses of the horses on the different treatments was tested using a CRF challenge test (to test the HPA-axis function) and a Novel Object test (to test temperamental differences) respectively. Especially in the first week after stabling pair housed horses spent more time eating whereas individually housed horses spent more time either standing vigilant or sleeping. Stress-related behaviours like neighing, pawing, nibbling and snorting were all displayed significantly more frequently in the individually housed horses (P<0.01). At the end of the study 67% of the individually housed horses was seen performing one or more stereotypies (P<0.01). The cortisol response and ACTH response on the CRF challenge test were lower for horses in the individually housed boxes. It is suggested that this depression in socially isolated animals is caused by a desensitisation of the HPA axis in response to stress-induced elevations in ACTH and cortisol. In general there was no effect of the treatment on the reactivity of the horses during the Novel Object test. However, there were significant relations between the responses of horses in the Novel Object test and in the stable environment. It is concluded that sudden isolated stabling is stressful to young and naïve horses, resulting in a high prevalence of stereotypies and abnormal behaviours. This study also provided some support for the notion that social stress in horses may be associated with a blunted adrenocortical response to CRF challenge. The finding that responses of horses to a behavioural test are correlated with home environment behaviours suggests that individual horses exhibit consistent behavioural traits across different contexts, and opens the possibility of using behavioural tests in horses to predict more general underlying behavioural characteristics. |
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0168-1591 |
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Equine Behaviour @ team @ |
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6630 |
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Bussières, G.; Jacques, C.; Lainay, O.; Beauchamp, G.; Leblond, A.; Cadoré, J.-L.; Desmaizières, L.-M.; Cuvelliez, S.G.; Troncy, E. |
Title |
Development of a composite orthopaedic pain scale in horses |
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Journal Article |
Year |
2008 |
Publication |
Research in Veterinary Science |
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85 |
Issue |
2 |
Pages |
294-306 |
Keywords |
Horse; Acute orthopaedic pain; Experimental model; Behaviour; Physiological parameters; Validation |
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This study addresses development and validation of a composite multifactorial pain scale (CPS) in an experimental equine model of acute orthopaedic pain. Eighteen horses were allocated to control (sedation with/without epidural analgesia – mixture of morphine, ropivacaine, detomidine and ketamine) and experimental groups: amphotericin-B injection in the tarsocrural joint induced pain and analgesia was either i.v. phenylbutazone administered post-induction of synovitis, or pre-emptive epidural mixture, or a pre-emptive combination of the 2. Inter- and intra-observer reproducibility was good (0.8<K<1). The key specific and sensitive behavioural indices were response to palpation of the painful area, posture, and, of lesser value, pawing on the floor, kicking at abdomen and head movement. Of particular interest was the statistical correlation observed between the CPS and both non-invasive blood pressure (P<0.0001) and blood cortisol (P<0.002). This study established the value of some behavioural and physiological criteria in determining equine orthopaedic pain intensity and clearly demonstrated that pre-emptive, multimodal analgesia provided better management than the two other protocols tested. |
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0034-5288 |
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Equine Behaviour @ team @ |
Serial |
6707 |
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Author |
Sullivan, K.A.; Hill, A.E.; Haussler, K.K. |
Title |
The effects of chiropractic, massage and phenylbutazone on spinal mechanical nociceptive thresholds in horses without clinical signs |
Type |
Journal Article |
Year |
2008 |
Publication |
Equine Veterinary Journal |
Abbreviated Journal |
Equine Vet J |
Volume |
40 |
Issue |
1 |
Pages |
14-20 |
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REASON FOR PERFORMING STUDY: Common methods used to treat back problems in horses need to be assessed objectively. OBJECTIVES: To measure spinal mechanical nociceptive thresholds (MNTs) and evaluate the effects of chiropractic, massage and phenylbutazone, compared with active and inactive control groups. METHODS: Baseline MNTs at 7 sites within the thoracolumbar and sacral regions were measured in 38 healthy mature horses exhibiting no clinical signs of lumbar pain. Horses were assigned to one of 3 treatment groups: instrument-assisted chiropractic treatment, therapeutic massage and phenylbutazone; or 2 control groups: ridden exercise (active control) or routine paddock turnout with no ridden exercise (inactive control). MNT measurements were repeated at 1, 3 and 7 days post treatment. The percentage change from baseline MNT values was calculated within groups. RESULTS: On Day 7, the median MNT had increased by 27, 12 and 8% in the chiropractic, massage and phenylbutazone groups, respectively. MNT changes of <1% were seen within the active and inactive control groups. CONCLUSIONS: Chiropractic treatment and massage therapy increased spinal MNTs within horses not exhibiting signs of lumbar pain. POTENTIAL RELEVANCE: Pressure algometry provides an objective tool to evaluate the effects of commonly used, but currently unproven treatment modalities on spinal MNTs. Future studies need to evaluate combined treatment effects and longer-term MNT changes in horses with documented back pain. |
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Valley Central High School, Montgomery, New York 12549 |
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0425-1644 |
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PMID:18083655 |
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Equine Behaviour @ team @ |
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4356 |
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Author |
Weishaupt, M.A. |
Title |
Adaptation strategies of horses with lameness |
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Journal Article |
Year |
2008 |
Publication |
The Veterinary Clinics of North America. Equine Practice |
Abbreviated Journal |
Vet Clin North Am Equine Pract |
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24 |
Issue |
1 |
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79-100 |
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The skill to diagnose lameness in horses is paramount for every equine practitioner. Early recognition of locomotor deficiencies plays a central role in sports medicine management, preventing deterioration of the disease or catastrophic injuries. Horses use characteristic compensatory movements of specific body parts to decrease loading of the affected limb. This article describes the underlying changes in intra- and interlimb coordination and the resulting load redistribution between the limbs. This enables the practitioner to better understand the changes in movement associated with lameness. |
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Equine Department, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, CH-8057 Zurich, Switzerland. mweishaupt@vetclinics.uzh.ch |
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1558-4224 |
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PMID:18314037 |
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Equine Behaviour @ team @ |
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4372 |
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O'Grady, S.E. |
Title |
Basic farriery for the performance horse |
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Journal Article |
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2008 |
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The Veterinary Clinics of North America. Equine Practice |
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Vet Clin North Am Equine Pract |
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24 |
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1 |
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203-218 |
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Proper farriery promotes a healthy functional foot and biomechanical efficiency and prevents lameness. Because the equine veterinarian is responsible for the soundness of the horse, a working knowledge of farriery becomes essential. A thorough knowledge of traditional horseshoeing enables the veterinarian to interact with the farrier at the farrier's level; this ultimately enhances and promotes quality hoof care. This article focuses on fundamental farriery and recognizing subtle changes in hoof conformation that can be used to preserve the integrity of the hoof capsule, along with the structures enclosed within, and thus prevent lameness in the performance horse. |
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Northern Virginia Equine, 8170 Patrickswell Lane, Marshall, VA 20115, USA. sogrady@look.net |
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PMID:18314044 |
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Equine Behaviour @ team @ |
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4373 |
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Warren-Smith, A.K.; McGreevy, P.D. |
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Preliminary investigations into the ethological relevance of round-pen (round-yard) training of horses |
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Journal Article |
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2008 |
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Journal of Applied Animal Welfare Science |
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11 |
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3 |
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285-298 |
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Recently, training horses within round-pens has increased in popularity. Practitioners often maintain that the responses they elicit from horses are similar to signals used with senior conspecifics. To audit the responses of horses to conspecifics, 6 mare-young-horse dyads, this study introduced them to each other in a round-pen and videoed them for 8 min. These dyads spent significantly more time farther than 10 m apart than they did less than 1 m apart (p < .001). The time they spent less than 1 m apart decreased over the 8-min test period (p = .018). Mares occupied the center of the round-pen and chased youngsters for 0.73% of the test period (p < .001). Mares made all agonistic approaches (p < .001), and youngsters (p = .018) made all investigative approaches. Head lowering and licking-and-chewing were exhibited most when the youngsters were facing away from the mares (p < .001). The frequency of head lowering increased during the test period (p = .027), whereas the frequency of licking-and-chewing did not change. The results bring into question the popular interpretation and ethological relevance of equine responses commonly described in round-pen training and show that mares did not condition young horses to remain in close proximity to them. |
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Faculty of Veterinary Science, University of Sydney, Sydney, NSW, Australia |
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Cited By (since 1996): 1; Export Date: 13 November 2008; Source: Scopus |
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Equine Behaviour @ team @ |
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4657 |
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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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