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Author |
Kaminski, G.; Gentaz, E.; Mazens, K. |
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Title |
Development of children’s ability to detect kinship through facial resemblance |
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Journal Article |
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Year |
2012 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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15 |
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3 |
Pages |
421-427 |
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Biomedizin & Life Sciences |
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Abstract |
Facial features appear to be a prominent kinship cue for ascribing relatedness among human individuals. Although there is evidence that adults can detect kinship in unrelated and unfamiliar individual’s faces, it remains to be seen whether people already possess the ability when they are young. To further understand the development of this skill, we explored children’s ability to detect parent-offspring resemblance in unrelated and unfamiliar faces. To this end, we tested approximately 140 children, aged 5–11, in two photo-matching tasks. We used a procedure that asked them to match one neonate’s face to one of three adults’ faces (Task 1), or to match one adult’s face to one of three neonate’s faces (Task 2). Our findings reveal asymmetrical performance, depending on the tasks assigned (performance of Task 2 is stronger than for Task 1), and on the sex of individuals who made up the parent-offspring pair (male parents are better matched with neonates than female parents, and boys are better matched than girls). The picture that emerges from our study is, on one hand, that the ability to detect kinship is already present at the age of five but continues to improve as one gets older, and on the other, that perception of parent-offspring facial resemblance varies according to the appraisers’ characteristics. |
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Springer Berlin / Heidelberg |
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1435-9448 |
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Equine Behaviour @ team @ |
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5605 |
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Author |
Meyer, S.; Nürnberg, G.; Puppe, B.; Langbein, J. |
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Title |
The cognitive capabilities of farm animals: categorisation learning in dwarf goats (Capra hircus) |
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Journal Article |
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Year |
2012 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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Volume |
15 |
Issue |
4 |
Pages |
567-576 |
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Biomedizin & Life Sciences |
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Abstract |
The ability to establish categories enables organisms to classify stimuli, objects and events by assessing perceptual, associative or rational similarities and provides the basis for higher cognitive processing. The cognitive capabilities of farm animals are receiving increasing attention in applied ethology, a development driven primarily by scientifically based efforts to improve animal welfare. The present study investigated the learning of perceptual categories in Nigerian dwarf goats ( Capra hircus ) by using an automated learning device installed in the animals’ pen. Thirteen group-housed goats were trained in a closed-economy approach to discriminate artificial two-dimensional symbols presented in a four-choice design. The symbols belonged to two categories: category I, black symbols with an open centre (rewarded) and category II, the same symbols but filled black (unrewarded). One symbol from category I and three different symbols from category II were used to define a discrimination problem. After the training of eight problems, the animals were presented with a transfer series containing the training problems interspersed with completely new problems made from new symbols belonging to the same categories. The results clearly demonstrate that dwarf goats are able to form categories based on similarities in the visual appearance of artificial symbols and to generalise across new symbols. However, the goats had difficulties in discriminating specific symbols. It is probable that perceptual problems caused these difficulties. Nevertheless, the present study suggests that goats housed under farming conditions have well-developed cognitive abilities, including learning of open-ended categories. This result could prove beneficial by facilitating animals’ adaptation to housing environments that favour their cognitive capabilities. |
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Springer Berlin / Heidelberg |
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Equine Behaviour @ team @ |
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5615 |
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Spagnoletti, N.; Visalberghi, E.; Verderane, M.P.; Ottoni, E.; Izar, P.; Fragaszy, D. |
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Stone tool use in wild bearded capuchin monkeys, Cebus libidinosus. Is it a strategy to overcome food scarcity? |
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Journal Article |
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Year |
2012 |
Publication |
Animal Behaviour |
Abbreviated Journal |
Anim. Behav. |
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83 |
Issue |
5 |
Pages |
1285-1294 |
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Keywords |
bearded capuchin; Cebus libidinosus; fallback food; necessity hypothesis; nut cracking; opportunity hypothesis; tool use |
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To determine whether tool use varied in relation to food availability in bearded capuchin monkeys, we recorded anvil and stone hammer use in two sympatric wild groups, one of which was provisioned daily, and assessed climatic variables and availability of fruits, invertebrates and palm nuts. Capuchins used tools to crack open encased fruits, mostly palm nuts, throughout the year. Significant differences between wet and dry seasons were found in rainfall, abundance of invertebrates and palm nuts, but not in fruit abundance. Catulè nuts were more abundant in the dry season. We tested the predictions of the necessity hypothesis (according to which tool use is maintained by sustenance needs during resource scarcity) and of the opportunity hypothesis (according to which tool use is maintained by repeated exposure to appropriate ecological conditions, such as preferred food resources necessitating the use of tools). Our findings support only the opportunity hypothesis. The rate of tool use was not affected by provisioning, and the monthly rate of tool use was not correlated with the availability of fruits and invertebrates. Conversely, all capuchins cracked food items other than palm nuts (e.g. cashew nuts) when available, and adult males cracked nuts more in the dry season when catulè nuts (the most common and exploited nut) are especially abundant. Hence, in our field site capuchins use tools opportunistically. |
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0003-3472 |
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Equine Behaviour @ team @ |
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5855 |
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Palme, R. |
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Title |
Monitoring stress hormone metabolites as a useful, non-invasive tool for welfare assessment in farm animals |
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Journal Article |
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Year |
2012 |
Publication |
Animal Welfare |
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21 |
Issue |
3 |
Pages |
331-337 |
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animal welfare, corticosterone, cortisol, faeces, farm animals, stress |
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A multitude of endocrine mechanisms are involved in coping with challenges. Glucocorticoids, secreted by the adrenal glands, are in the front line of the battle to overcome stressful situations. They are usually measured in plasma samples as parameters of adrenal activity and thus of disturbance. Unfortunately, collecting blood samples itself can disturb an animal. Thus, non-invasive methods for the determination of glucocorticoids or their metabolites have become increasingly popular. The pros and cons of various non-invasive sample materials (saliva, excreta, milk, hair/feathers and eggs) for glucocorticoid determination are given. Above all, faecal samples offer the
advantage that they can be collected easily. In faecal samples, circulating hormone levels are integrated over a certain period of time and represent the cumulative secretion of hormones. Thus, the levels are less affected by short fluctuations or the pulse-like nature of hormone secretion. However, using this technique to assess an animal’s adrenocortical activity is not especially simple. Whether frequent sampling is necessary or single samples will suffice depends upon the study’s aim (whether one is examining the impact of acute or chronic stressors). Background knowledge of the metabolism and excretion of cortisol/corticosterone metabolites is required and a careful validation for each species and sex investigated is obligatory. The present review also addresses analytical issues regarding sample storage, extraction procedures and immunoassays and includes a comprehensive list of published studies (up to 2011) describing the use of such methods in farmed animals. Applied properly, non-invasive techniques to monitor glucocorticoid metabolites in faecal samples of various species are a useful tool for welfare assessment, especially as they are easily applied at farm or group level. |
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0962-7286 |
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Equine Behaviour @ team @ |
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5793 |
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Author |
Watanabe, N.M.; Stahlman, W.D.; Blaisdell, A.P.; Garlick, D.; Fast, C.D.; Blumstein, D.T. |
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Title |
Quantifying personality in the terrestrial hermit crab: Different measures, different inferences |
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Journal Article |
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Year |
2012 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
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91 |
Issue |
2 |
Pages |
133-140 |
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Keywords |
Animal personality; Behavioral syndrome; Hermit crabs |
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There is much interest in studying animal personalities but considerable debate as to how to define and evaluate them. We assessed the utility of one proposed framework while studying personality in terrestrial hermit crabs (Coenobita clypeatus). We recorded the latency of individuals to emerge from their shells over multiple trials in four unique manipulations. We used the specific testing situations within these manipulations to define two temperament categories (shyness-boldness and exploration-avoidance). Our results identified individual behavioral consistency (i.e., personality) across repeated trials of the same situations, within both categories. Additionally, we found correlations between behaviors across contexts (traits) that suggested that the crabs had behavioral syndromes. While we found some correlations between behaviors that are supposed to measure the same temperament trait, these correlations were not inevitable. Furthermore, a principal component analysis (PCA) of our data revealed new relationships between behaviors and provided the foundation for an alternate interpretation: measured behaviors may be situation-specific, and may not reflect general personality traits at all. These results suggest that more attention must be placed on how we infer personalities from standardized methods, and that we must be careful to not force our data to fit our frameworks. |
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0376-6357 |
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Equine Behaviour @ team @ |
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5620 |
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Author |
Austin, N.P.; Rogers, L.J. |
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Title |
Limb preferences and lateralization of aggression, reactivity and vigilance in feral horses, Equus caballus |
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Journal Article |
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Year |
2012 |
Publication |
Animal Behaviour |
Abbreviated Journal |
Anim. Behav. |
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83 |
Issue |
1 |
Pages |
239-247 |
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Keywords |
aggression; behavioural asymmetry; Equus caballus; eye preference; feral horse; limb preference; reactivity; side bias |
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Observational field studies were conducted on two remote populations of feral horses in Australia to determine whether lateralization is a characteristic of Equus caballus as a species or results from handling by humans. Group 1 had been feral for two to five generations and Group 2 for 10–20 generations. In both groups, left-side biases were present during agonistic interactions and in reactivity and vigilance. Therefore, as in other vertebrates, the right hemisphere appears to be specialized to control agonistic behaviour and responses to potential threats. The leftwards bias was stronger in measures of behaviour involving more aggression and reactivity. Preferences to place one forelimb in front of the other during grazing were also determined. No population bias of forelimb preference was found, suggesting that such limb preferences present in domestic horses may be entrained. Since stronger individual limb preferences were found in immature than in adult feral horses, limb preference may be modified by maturation or experience in the natural habitat. Stronger limb preference was associated significantly with elevated attention to the environment but only in younger feral horses. No sex differences in lateralization were found. The findings are evidence that horses show visual lateralization, as in other vertebrates, not dependent on handling by humans. Limb preference during grazing, by contrast, does appear to depend on experience. |
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0003-3472 |
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Equine Behaviour @ team @ |
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5651 |
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Author |
Ben-Shlomo, G.; Plummer, C.; Barrie, K.; Brooks, D. |
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Title |
Characterization of the normal dark adaptation curve of the horse |
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Journal Article |
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Year |
2012 |
Publication |
Veterinary Ophthalmology |
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15 |
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1 |
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42-45 |
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adaptation; curve; dark; electroretinography; equine; scotopic |
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Objective The goal of this work is to study the dark adaptation curve of the normal horse electroretinogram (ERG). Procedures The electroretinographic responses were recorded from six healthy female ponies using a contact lens electrode and a mini-Ganzfeld electroretinographic unit. The horses were sedated intravenously with detomidine, an auriculopalpebral nerve block was then performed, and the pupil was fully dilated. The ERG was recorded in response to a low intensity light stimulus (30 mcd.s/m2) that was given at times (T) T = 5, 10, 15, 20, 25, 30, 40, 50, and 60 min of dark adaptation. Off-line analysis of the ERG was then performed. Results Mean b-wave amplitude of the full-field ERG increased continuously from 5 to 25 min of dark adaptation. The b-wave amplitude peaked at T = 25, however, there was no statistical significance between T = 20 and T = 25. The b-wave amplitude then remained elevated with no significant changes until the end of the study at T = 60 (P > 0.49). The b-wave implicit time increased continuously between T = 5 and T = 20, then gradually decreased until T = 60. No distinct a-wave was observed during the testing time. Conclusions Evaluation of horse rod function or combined rod/cone function by means of full-field ERG should be performed after a minimum 20 min of dark adaptation. |
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Blackwell Publishing Ltd |
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1463-5224 |
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Equine Behaviour @ team @ |
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5626 |
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Author |
Casella, S.; Fazio, F.; Giannetto, C.; Giudice, E.; Piccione, G. |
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Title |
Influence of transportation on serum concentrations of acute phase proteins in horse |
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Journal Article |
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Year |
2012 |
Publication |
Research in Veterinary Science |
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93 |
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2 |
Pages |
914-917 |
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Acute phase proteins; Horse; Transportation stress; Welfare; White Blood Cells |
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The modifications of Haptoglobin (Hp), Serum Amyloid A (SAA), Fibrinogen (Fbg) and White Blood Cells (WBCs) were evaluated in 15 Saddle Italian horses. Ten horses were transported covering a distance of about 320 km within 4 h with an average speed of 80 km/h (experimental group) and five horses were not subject to transportation (control group). Blood was collected via jugular venipuncture before the transportation (T0), immediately after the transportation (T1), 12 (T12), 24 (T24) and 48 (T48) hours after the transportation in experimental group and at the same time point in control group. For each parameter statistical analysis of different groups and sampling time was performed using a two-way analysis of covariance, with the data before the transportation (T0) as the covariate, by the GLM procedure of SAS. For all parameters the interaction (Group × Time) was tested and it was resulted no significant. The application of statistical analysis showed significant differences between the control group and horses subjected to transportation (P < 0.01), and the influence of sampling time (P < 0.05) on Hp, SAA and WBCs. These modifications appeared to be innovative showing that equine Hp, generally considered as moderate acute phase protein, increases more rapidly than the SAA after transportation-induced stress. |
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0034-5288 |
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Equine Behaviour @ team @ |
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5843 |
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Author |
Hoffmann, G.; Bentke, A.; Rose-Meierhöfer, S.; Berg, W.; Mazetti, P.; Hardarson, G.H. |
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Title |
Influence of an active stable system on the behavior and body condition of Icelandic horses |
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Journal Article |
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Year |
2012 |
Publication |
animal |
Abbreviated Journal |
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6 |
Issue |
10 |
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1684-1693 |
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activity, automatic feeding system, behavior, body condition score, Icelandic horse |
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Horses are often stabled in individual boxes, a method that does not meet their natural needs and may cause psychical and
musculoskeletal diseases. This problem is particularly evident in Iceland, where horses often spend the long winter periods in cramped
boxes. The aim of this study was to analyze the suitability of a group housing system in Iceland, but the results are also applicable to
horses of other regions. Eight Icelandic horses were observed in an active stable system, and their behavior and time budget were
recorded. Movement and lying behavior were studied with ALT (Activity, Lying, Temperature detection) pedometers. The effect of an
automatic concentrate feeding station (CFS) on the horses’ behavior was examined. In the first period of investigation, the horses
were fed concentrates manually, and in the second period, they were fed with the CFS. Additional behavioral observations and a
determination of social hierarchy occurred directly or by video surveillance. The physical condition of the horses was recorded by body
weight (BW) measurement and body condition scoring (BCS). The results showed a significant increase between the first and second
trial periods in both the activity (P,0.001) and the lying time (P50.003) of the horses with use of the CFS. However, there was no
significant change in BW during the first period without the CFS (P50.884) or during the second period with the CFS (P50.540).
The BCS of the horses was constant at a very good level during both trial periods, and the horses showed a low level of aggression, a
firm social hierarchy and behavioral synchronization. This study concludes that group housing according to the active stable principle is
a welfare-friendly option for keeping horses and is a suitable alternative to conventional individual boxes. |
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Cambridge Journals Online |
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1751-732x |
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Equine Behaviour @ team @ |
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5759 |
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Author |
Wickert, Marion |
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Title |
Die Bedeutung des Leerkauens bei Pferden aus Sicht der Physiologie und der Ethologie |
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Manuscript |
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2012 |
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Der Umgang mit Pferden erfreut sich immer größerer Beliebtheit. Aufgrund des Verhaltens können Rückschlüsse auf die Befindlichkeiten der Tiere gezogen werden
(TSCHANZ et al. 1997a). Je mehr wir über das Verhalten der Tiere wissen, desto besser können wir in der Haltung, Ausbildung und Nutzung der Pferde dazu beitragen, die Lebensbedingungen zu verbessern und den Ansprüchen der Pferde gerechter zu werden.
Bei der Ausbildung von Pferden kommen u.a. aus Amerika neue Einflüsse auf Ausbildungsmethoden zu uns. Es wird dabei immer wieder ein „Kauen“ der Pferde während des Trainings beschrieben, doch gibt es keine wissenschaftlichen ntersuchungen darüber.
Eine Kaubewegung des Pferdes außerhalb der Futteraufnahme wird als „Leerkauen“
definiert. Es ist eine „horizontale Bewegung“ des Unterkiefers gegen den Oberkiefer zu beobachten, vergleichbar mit der Mahlbewegung (Abbildung 1). Häufig ist während des Leerkauens eine Anspannung des oberflächlichen Kaumuskels vom unteren Unterkieferrand aus in Richtung Jochbogen/Crista facialis zu erkennen.
Eine Sonderform des Leerkauens stellt die sogenannte Unterlegenheitsgebärde (UG)
dar (ZEEB 1959b). Es handelt es sich um eine „vertikale Bewegung“ der Unter- und
Oberkiefer voneinander weg und aufeinander zu (Abbildung 2). Ihre Funktion ist die
Beschwichtigung. Unter dem Begriff Leerkauen wird in dieser Dissertation immer die
horizontale Mahlbewegung verstanden. |
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Freie Universität Berlin |
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Doctoral thesis |
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978-3-86387-209-0 |
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Equine Behaviour @ team @ |
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5739 |
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