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Hausberger, M.; Le Scolan, N.; Muller, C.; Gautier, E.; Wolff, A. |
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Title |
Individual behavioural characteristics in horses: predictability, endogenous and environmental factors |
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Year |
1996 |
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Journée d`Etude |
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Journée d`Etude |
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22 |
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113- 123 |
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Insitute du Cheval |
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Paris |
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Equine Behaviour @ team @ |
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5023 |
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Author |
Hama, H.; Yogo, M.; Matsuyama, Y. |
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Title |
Effects of stroking horses on both humans' and horses' heart rate responses |
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Journal Article |
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Year |
1996 |
Publication |
Japanese Psychological Research |
Abbreviated Journal |
Jpn. Psychol. Res. |
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38 |
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2 |
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66-73 |
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The present study examined both human and horse heart rates (HRs) when humans stroked horses for 90 seconds; the subjective arousal levels of the humans were measured by the Tohoku Activation Deactivation Adjective Check List before and after stroking horses. Six male subjects with a positive attitude toward companion animals and 6 male subjects with a negative attitude were selected by their scores on the Pet Attitude Scale, and these two groups, together with a third group, of 6 subjects who were male members of the Doshisha University horse-riding club, participated in this experiment. The HRs of the human subjects during the first 10 seconds immediately after the stroking began were significantly higher than those obtained after that period, but these higher levels gradually returned to baseline levels. This tendency appears more clearly in the negative attitude group. The HRs of the horses increased during the first 20 seconds immediately after the human subjects of the NA group started stroking them, but gradually reduced as the stroking continued. The results of subjective arousal levels suggest a decrease in tension by stroking horses. These results suggest that a certain affectional interaction may exist between humans and companion animals. |
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Equine Behaviour @ team @ |
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5056 |
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Author |
de Waal, F.B.M.; Aureli, F. |
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Title |
Consolation, reconciliation, and a possible cognitive difference between macaque and chimpanzee |
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Year |
1996 |
Publication |
Reaching into Thought: The Minds of the Great Apes |
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80–110. |
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Russon,A.E.; Bard, K.A.; Parker, S.T. |
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Cambridge University Press |
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Cambridge |
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Russon,A.E.; Bard, K.A.; Parker, S.T. |
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Equine Behaviour @ team @ |
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5060 |
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Mertens, P.A.; Unshelm, J. |
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Title |
Effects of Group and Individual Housing on the Behavior of Kennelled Dogs in Animal Shelters |
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Journal Article |
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Year |
1996 |
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Anthrozoos: A Multidisciplinary Journal of The Interactions of People & Animals |
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9 |
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40-51 |
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To emphasize the effects of group- and single housing of kennelled dogs, the behavior of 211 dogs in two German animal shelters was tested and observed. After being placed, 197 of the dogs' new owners were interviewed.
Although 51% of the German animal shelters already keep dogs in groups, there is strong prejudice against group housing because of the fear of fights. This study demonstrates that this apprehension is unfounded. Ninety-one percent of the social confrontations between dogs housed together were settled by the use of behavioral rituals. Keeping dogs in groups, furthermore, leads to a significant reduction in noise emission (p<.001). Group housing fulfills the dog's need for social interaction and the need to move. Dogs that were housed in groups displayed a closer human-animal relationship (80%) than those that had been kept individually (43%). A high percentage of individually housed dogs suffered from behavioral problems (31%) and 10% developed stereotypes. The percentage of behaviorally disturbed dogs observed in group housing was 11%, and stereotyped forms of behavior did not occur. Dogs who had been kept in groups were, on average, placed within 10 days, and were returned to the animal shelter less often (9%) compared to those housed individually (25%). Dogs that were housed separately needed an average of 17 days to be placed. Even after being placed, there is a correlation between the animal shelter's type of housing and the dog's behavior. Within four weeks after picking up their pet, 88% of the owners of dogs that had been housed individually complained of problems compared to the owners of the dogs that had been kept in groups, 53% of whom were completely satisfied with the adoption.
Despite the fact that these results might be influenced by the small number of shelters examined, the study leads to the conclusion that keeping dogs in groups is a suitable alternative for dog housing in animal shelters and, for the animals' welfare, is preferable to individual housing. |
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Equine Behaviour @ team @ |
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5165 |
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Author |
Gueron, S.; Levin, S.A.; Rubenstein, D.I. |
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Title |
The Dynamics of Herds: From Individuals to Aggregations |
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Journal Article |
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Year |
1996 |
Publication |
Journal of Theoretical Biology |
Abbreviated Journal |
J. Theor. Biol. |
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Volume |
182 |
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1 |
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85-98 |
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The dynamic behavior of small herds is investigated by means of simulations of two-dimensional discrete-stochastic models. An individual-based approach is used to relate collective behavior to individual decisions. In our model, the motion of an individual in a herd is assumed to be the combined result of both density-independent and density-dependent decisions, in the latter case based on the influence of surrounding neighbors; assumed decision rules are hierarchical, balancing short range repulsion against long-range attraction. The probability of fragmentation of the model herd depends on parameter values. We explore the variety and characteristics of spatial patterns that develop during migration, for herds that are homogeneous and heterogeneous regarding intrinsic walking speeds. Group integrity can be maintained even in mixed populations, but fragmentation results for these more easily than for a homogeneous herd. Observations of natural populations suggest that animals move away from individuals that intrude too closely into their environment, but are attracted to individuals at a distance. Between these extremes, there appears to be a neutral zone, within which other individuals engender no response. We explore the importance of this neutral zone, and offer evolutionary interpretations. In particular, the neutral zone, if not too large, permits the individual to remain in contact with the herd, while reducing the frequency with which acceleration or deceleration must be undertaken. This offers obvious energetic benefits. |
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0022-5193 |
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Equine Behaviour @ team @ |
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5253 |
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Author |
Frank S. A. |
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Title |
Policing and group cohesion when resources vary. |
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Journal Article |
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Year |
1996 |
Publication |
Animal Behaviour |
Abbreviated Journal |
Anim. Behav. |
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52 |
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1163-1169 |
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The transition from competing individuals to cooperative groups has occurred several times inevolutionary history. The puzzle is why selfish individuals did not subvert cohesive group behaviour bytaking resources without contributing to the group’s overall success. Kin selection and reciprocal altruism are the two standard explanations for group cohesion. But many groups have evolved into
cooperative units when relatedness was low and opportunities were limited for the strategic alliances required for reciprocity. A new theory was recently proposed in which individuals invest some of their resources into repressing competition between group members. Such policing increases the fair distribution of resources in the group and enhances group cohesion. The surprising aspect of this theory
is that low relatedness is more conducive to the spread of policing traits than is high relatedness. Here a new explanation is developed of the biological processes that favour policing. The model is then extended in two ways. First, more realism is added to the theory by accounting for the full range of costs and benefits associated with competitive and cooperative traits within groups. Second, another
surprising result is introduced about cooperative evolution. Small variations in individual vigour or resources can lead to large variations in individual contributions to policing the group. Stronger individuals often invest all of their excess resources into policing, but weaker individuals do not contribute to group cohesion. |
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Equine Behaviour @ team @ |
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5429 |
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Author |
Nishida, T.; Hosaka K. |
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Title |
Coalition strategies among adult male chimpanzees of the Mahale Mountains, Tanzania. |
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Year |
1996 |
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Great Ape Societies. |
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114-135 |
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Cambridge University Press |
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Cambridge |
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McGrew, W. C.; Marchant, L. F.; Nishida, T. |
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Equine Behaviour @ team @ |
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5470 |
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Beerda, B.; Schilder, M.B.H.; Janssen, N.S.C.R.M.; Mol, J.A. |
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The Use of Saliva Cortisol, Urinary Cortisol, and Catecholamine Measurements for a Noninvasive Assessment of Stress Responses in Dogs |
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1996 |
Publication |
Hormones and Behavior |
Abbreviated Journal |
Horm. Behav. |
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30 |
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3 |
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272-279 |
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A problem in assessing animal welfare is that collecting data in itself may be stressful to the animals. Therefore, noninvasive methods for collecting data have to be devised and tested. A first step in investigating saliva cortisol, urinary cortisol, and urinary catecholamine as noninvasive indicators of canine well-being is the validation of these hormonal measures as alternatives for those in plasma. Using a model of insulin (0.2 U/kg)-induced hypoglycemia, we report on stress-induced responses in saliva cortisol, urinary cortisol, and urinary catacholamines relative to cortisol and catecholamine responses in plasma. Hypoglycemia in six dogs induced significant (P< 0.05) increases in plasma cortisol and adrenaline but not noradrenaline. Saliva cortisol responses expressed as net area under the response curve correlated significantly with plasma cortisol responses (r> 0.92). Saliva cortisol levels measured 7 to 12% of plasma cortisol concentrations. Cortisol/creatinine ratios in urine were significantly higher when voided after insulin administeration, compared to when voided after saline treatment. Insulin-induced increments in cortisol/creatinine ratios were nonsignificant when urine samples were assayed after dichloromethane extraction. Although urinary adrenaline/creatinine (A/C) ratios were significantly correlated with maximum plasma adrenaline values after insulin administration, A/C ratios did not differ significantly between insulin and saline treatment. The present experiment provides strong support for using saliva sampling and urine collection as noninvasive methods to establish stress-induced cortisol responses. For measuring acute plasma adrenaline responses, measuring A/C ratios may not be a valid alternative. |
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0018-506x |
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Equine Behaviour @ team @ |
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5574 |
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Author |
Tomasello, M. |
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Do apes ape? |
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1996 |
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Social learning in animals: the roots of culture |
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319-346 |
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Academic Press |
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London |
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Heyes, C. M.; Galef, B.G. |
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Equine Behaviour @ team @ |
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5600 |
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Kruska, D. |
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The effect of domestication on brain size and composition in the mink (Mustela vison) |
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1996 |
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J Zool |
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239 |
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Equine Behaviour @ team @ Kruska1996 |
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6234 |
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