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Siegel, H.S. |
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Title |
Effects of behavioural and physical stressors on immune responses. |
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1987 |
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Biology of Stress in Farm Animals |
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Martinus Nijhoff |
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London |
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Equine Behaviour @ team @ |
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5994 |
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Author |
Keeling, L.J.; Bøe, K.E.; Christensen, J.W.; Hyyppä, S.; Jansson, H.; Jørgensen, G.H.M.; Ladewig, J.; Mejdell, C.M.; Särkijärvi, S.; Søndergaard, E.; Hartmann, E. |
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Title |
Injury incidence, reactivity and ease of handling of horses kept in groups: a matched case control study in four Nordic countries |
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Applied Animal Behaviour Science |
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Appl Anim Behav Sci |
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Keywords |
horse; behaviour; reactivity; injury; welfare; management |
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Abstract There is increasing interest in keeping horses in groups, but progress is hampered by a lack of knowledge about which horses can and should be kept together. Therefore, our objective was to investigate the effect of group composition on the occurrence of injuries among horses, the ease of removing horses from groups and horses’ reactivity to a fearful stimulus. Using a matched case control design, 61 groups of horses were studied in Denmark, Norway, Finland and Sweden. They were allocated into groups of similar or different age and sex or where membership changed regularly or remained stable. Injuries were recorded before mixing the horses into treatment groups, the day after mixing and four weeks later. Reactivity of horses to a moving novel object and the behaviour of a horse being removed from its group and the reactions of other group members towards this horse and the handler were evaluated. It was hypothesized that a more socially variable group composition has beneficial effects on behaviour, ease of handling and reducing reactivity whereas frequent changes in group composition has negative consequences, resulting in more injuries. We found that differences in treatment effects were mainly related to breed, rather than group composition. Icelandic horses reacted less to the movement of the novel object (P = 0.007) and approached it more afterwards (P = 0.04). They also had fewer new injuries than warmbloods following mixing (P < 0.001) and fewer than all other groups 4 weeks later (P < 0.01). Most new injuries after mixing were minor and recorded on the horse’s head, chest, hind legs and rump. In conclusion, variations in sex and age composition of the group had little effect on injury level, reactivity and ease of handling compared to the general effect of breed. Concerns about the risk of severe injuries associated with keeping horses in groups are probably overestimated. Thus, we propose that horses can be successfully kept in groups of different sex and age composition. |
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0168-1591 |
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Equine Behaviour @ team @ |
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6020 |
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Taubert, J.; Weldon, K.B.; Parr, L.A. |
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Title |
Robust representations of individual faces in chimpanzees (Pan troglodytes) but not monkeys (Macaca mulatta) |
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Journal Article |
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2016 |
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Animal Cognition |
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Anim. Cogn. |
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1-9 |
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Being able to recognize the faces of our friends and family members no matter where we see them represents a substantial challenge for the visual system because the retinal image of a face can be degraded by both changes in the person (age, expression, pose, hairstyle, etc.) and changes in the viewing conditions (direction and degree of illumination). Yet most of us are able to recognize familiar people effortlessly. A popular theory for how face recognition is achieved has argued that the brain stabilizes facial appearance by building average representations that enhance diagnostic features that reliably vary between people while diluting features that vary between instances of the same person. This explains why people find it easier to recognize average images of people, created by averaging multiple images of the same person together, than single instances (i.e. photographs). Although this theory is gathering momentum in the psychological and computer sciences, there is no evidence of whether this mechanism represents a unique specialization for individual recognition in humans. Here we tested two species, chimpanzees (Pan troglodytes) and rhesus monkeys (Macaca mulatta), to determine whether average images of different familiar individuals were easier to discriminate than photographs of familiar individuals. Using a two-alternative forced-choice, match-to-sample procedure, we report a behaviour response profile that suggests chimpanzees encode the faces of conspecifics differently than rhesus monkeys and in a manner similar to humans. |
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1435-9456 |
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Equine Behaviour @ team @ Taubert2016 |
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6030 |
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Ringhofer, M.; Yamamoto, S. |
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Domestic horses send signals to humans when they face with an unsolvable task |
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2016 |
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Animal Cognition |
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Anim. Cogn. |
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1-9 |
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Some domestic animals are thought to be skilled at social communication with humans due to the process of domestication. Horses, being in close relationship with humans, similar to dogs, might be skilled at communication with humans. Previous studies have indicated that they are sensitive to bodily signals and the attentional state of humans; however, there are few studies that investigate communication with humans and responses to the knowledge state of humans. Our first question was whether and how horses send signals to their potentially helpful but ignorant caretakers in a problem-solving situation where a food item was hidden in a bucket that was accessible only to the caretakers. We then examined whether horses alter their behaviours on the basis of the caretakers’ knowledge of where the food was hidden. We found that horses communicated to their caretakers using visual and tactile signals. The signalling behaviour of the horses significantly increased in conditions where the caretakers had not seen the hiding of the food. These results suggest that horses alter their communicative behaviour towards humans in accordance with humans’ knowledge state. |
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1435-9456 |
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Equine Behaviour @ team @ Ringhofer2016 |
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6037 |
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Author |
Rocha, A.D. de L.; Menescal-de-Oliveira, L.; da Silva, L.F.S. |
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Title |
Effects of human contact and intra-specific social learning on tonic immobility in guinea pigs, Cavia porcellus |
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Journal Article |
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Year |
2017 |
Publication |
Applied Animal Behaviour Science |
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Appl. Anim. Behav. Sci. |
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Cohabitation; Fear; Motor response; Defensive behaviour; Predator-prey |
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Abstract Social learning is the capacity of animals to acquire adaptive information from others. In the case of fear responses, animals can learn fearful or non-fearful responses by observing the behavior of conspecifics. Tonic immobility (TI) is an anti-predatory behavior elicited during intense fear situations. Studies have revealed that regular contact with humans can reduce TI responses in animals. In our study, we evaluated the effect of human contact on the TI responses in guinea pigs. We also evaluated the effect of cohabitation (non-fearful animals with fearful animals) on their TI responses. To achieve this, we measured the TI responses induced by postural inversion and restraint in guinea pigs as a result of different treatments. In our first experiment, we determined the effect of human contact on TI responses by establishing 3 treatment groups: no contact, handled, and habituated. In our second experiment, we addressed the effect of social learning on TI response by testing TI response in habituated, and unhabituated animals that had cohabitated for 10 days. In the first experiment, 10 days of either handling or habituation did not prevent TI in guinea pigs, but habituation did increase latency [F(2,119) = 14.19; p < 0.0001] and handling or habituation decrease duration [F(2,119) = 15.01; p < 0.0001] of the TI behavior in the guinea pigs. In the second experiment, the cohabitation of unhabituated and habituated animals reduced TI duration [F(2,93) = 5.058; p < 0.008]. These data suggest that both forms of human interaction can reduce experimenter fear in guinea pigs. It therefore seems that unhabituated guinea pigs learn not to fear the experimenter by cohabitating with habituated guinea pigs. |
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0168-1591 |
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Equine Behaviour @ team @ |
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6133 |
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Author |
Hoffman, C.L.; Suchak, M. |
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Dog rivalry impacts following behavior in a decision-making task involving food |
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Journal Article |
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2017 |
Publication |
Animal Cognition |
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Anim. Cogn. |
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1-13 |
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Dogs learn a great deal from humans and other dogs. Previous studies of socially influenced learning between dogs have typically used a highly trained demonstrator dog who is unfamiliar to the observer. Because of this, it is unknown how dynamics between familiar dogs may influence their likelihood of learning from each other. In this study, we tested dogs living together in two-dog households on whether individual dogs’ rivalry scores were associated with performance on a local enhancement task. Specifically, we wanted to know whether dog rivalry impacted whether an observer dog would approach a plate from which a demonstrator dog had eaten all available food, or whether the observer dog would approach the adjacent plate that still contained food. Dog rivalry scores were calculated using the Canine Behavioral Assessment and Research Questionnaire and indicated each dog’s tendency to engage aggressively with the other household dog. Low-rivalry dogs were more likely to approach the empty plate than high-rivalry dogs when the observer dog was allowed to approach the plates immediately after the demonstrator had moved out of sight. This difference between low- and high-rivalry dogs disappeared, however, when observer dogs had to wait 5 s before approaching the plates. The same pattern was observed during a control condition when a human removed the food from a plate. Compared to low-rivalry dogs, high-rivalry dogs may pay less attention to other dogs due to a low tolerance for having other dogs in close proximity. |
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1435-9456 |
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Equine Behaviour @ team @ Hoffman2017 |
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6131 |
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Author |
Albright, J.; Sun, X.; Houpt, K. |
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Does cribbing behavior in horses vary with dietary taste or direct gastric stimuli? |
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Applied Animal Behaviour Science |
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Appl Anim Behav Sci |
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Horse; Stereotypy; Cribbing; Diet |
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Abstract Concentrated feed diets have been shown to drastically increase the rate of the cribbing, an oral stereotypy in horses, but the specific component causing the rise has not been identified. Furthermore, the mechanism through which feed affects cribbing has not been explored. In the first experiment of this study, we quantified the latency to crib and number of cribs in 15 min after the horses tasted various grain, sugar, and artificial sweetener solutions. Undiluted grain stimulated the most cribs (P < 0.01) compared with all other solutions, and shortest latency to crib, although this was significantly higher only when compared with diluted grain (P = 0.03). In Experiment 2, latency to crib and number of cribs in 15 min after the grain and sugar solutions were administered via nasograstric tube were also evaluated. There were no statistical differences among cribbing responses to grain, fructose, and water administered directly to the stomach although grain stimulated cribbing behavior more quickly than 10% fructose (P = 0.03) and 100% tap water (P = 0.04). These results confirm that highly palatable diets, possibly mediated through the opioid and dopaminergic systems, are one of the most potent inducers of cribbing behavior. The highly palatable taste remains the probable “cribogenic” factor of concentrated diet, although gastric and post-gastric effects cannot be excluded. |
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0168-1591 |
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Equine Behaviour @ team @ |
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6123 |
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Author |
Krueger, K.; Marr, I.; Farmer, K. |
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Title |
Equine Cognition |
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Book Chapter |
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2017 |
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Encyclopedia of Animal Cognition and Behavior |
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1-11 |
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Springer International Publishing |
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Cham |
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Vonk, J.; Shackelford, T. |
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978-3-319-47829-6 |
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Equine Behaviour @ team @ Krueger2017 |
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6181 |
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Author |
McVey, A.; Wilkinson, A.; Mills, D.S. |
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Title |
Social learning in horses: the effect of using a group leader demonstrator on the performance of familiar conspecifics in a detour task |
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Journal Article |
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2018 |
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Applied Animal Behaviour Science |
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Equine; Imitation; Leader; Social facilitation; Social learning |
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Abstract |
Learning through the observation of others allows the transfer of information without the costs incurred during individual trial and error learning. Horses (Equus caballus) are a highly social species, which might be expected to be capable of learning from others, but experimental findings are inconsistent, and potentially confounded by social facilitation effects not related directly to the learning of the task. We refined the methods used in previous equine social learning studies, to examine and distinguish specific social influences on learning of a task: we used predefined group leaders rather than agonistically dominant individuals to demonstrate a detour task to familiar conspecific observers; in addition we had two control groups: a non-observer (true control) and a group with the demonstrator simply present at the goal (social facilitation control). 44 socially kept horses were allocated to one of the three test conditions and took part in five trials each. Success rate, latency and detour direction were recorded. There was no significant difference between the three groups in the likelihood of them succeeding in the task nor latency to succeed; however there was a significant difference in the route chosen by the groups, with the true control choosing the side with the entrance gate significantly more than either the observer group or social facilitation group. Both of the latter two groups chose to go in the same direction relative to themselves, regardless of which side the gate was. Seven out of nine horses in the observer group chose the same direction as their demonstrator every time. Our results show a significant role of social facilitation on detour behaviour and highlight the importance of including adequate controls for simpler cognitive influences on behaviour before claims can be made about the specific learning of motor actions or goal directed behaviour. Social cues may be important to horses if the task is sufficiently challenging and motivationally important, so future work should consider more demanding, but ecologically relevant situations, in order to maximise the potential revelation of social learning effects which do not depend on simple local or stimulus enhancement effects. |
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0168-1591 |
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Equine Behaviour @ team @ |
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6395 |
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Author |
McGreevy, P.; Yeates, J. |
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Title |
Horses (Equus caballus) |
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Book Chapter |
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2018 |
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Companion Animal Care and Welfare |
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animal company; behavioural signs; diseases; domestic horses; euthanasia; human interaction; nutritional requirements |
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Summary Domestic horses are equid members of the class Mammalia, order Perissodactyla, and family Equidae. Horses are obligate herbivores, with nutritional requirements as listed in a table. Adequate space is necessary for exercise, exploration, flight, sharing resources, play, and rolling. Company is essential for all horses, including stallions. Company provides opportunities for mutual grooming and play and allows horses to stand head-to-tail to remove flies. Unhandled horses may respond to humans as they would to predators, whereas handled horses' responses depend on their previous interactions with humans. Horses can suffer from several diseases as listed in another table. The best method of euthanasia of horses is usually sedation followed by either cranial shooting or the injection of an overdose of pentobarbitone into the jugular vein. Behavioural signs of distress can include increased locomotory activity, vigilance behaviours, neighing, snorting, pawing, nibbling walls and buckets, defaecation, rearing, kicking stable walls or doors, and high-stepping 'prancing'. |
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Wiley Online Books |
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Companion Animal Care and Welfare |
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9781119333708 |
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doi:10.1002/9781119333708.ch13 |
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Equine Behaviour @ team @ |
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6506 |
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