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| Author | Miller, R.M. | ||||
| Title | How the dominance hierarchy is determined: The body language of the horse | Type | Journal Article | ||
| Year | 1995 | Publication | Journal of Equine Veterinary Science | Abbreviated Journal | |
| Volume | 15 | Issue | 12 | Pages  |
514-515 |
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 4306 | ||
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| Author | Yamakoshi G; Sugiyama Y | ||||
| Title | Pestle-pounding behavior of wild chimpanzees at Bossou, Guinea: a newly observed tool-using behavior | Type | Journal Article | ||
| Year | 1995 | Publication | Primates | Abbreviated Journal | Primates |
| Volume | 36 | Issue | Pages |
489 | |
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 3052 | ||
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| Author | Keverne, E.B. | ||||
| Title | Olfactory learning | Type | Journal Article | ||
| Year | 1995 | Publication | Current Opinion in Neurobiology | Abbreviated Journal | Curr. Opin. Neurobiol. |
| Volume | 5 | Issue | 4 | Pages |
482-488 |
| Keywords | olfactory perception mammals | ||||
| Abstract | Unravelling the mechanisms of learning and memory can, and should, be tackled at many levels. Discovery of the huge family of odourant receptor genes provided olfaction with `molecular' respectability similar to that afforded to the visual system. Consequently, molecular studies have dominated the olfactory literature this past year, even to the point of providing a molecular basis of olfactory perception. Needless to say, the molecular approach favours a `hard-wired' system; however, other results suggest that flexibility in the olfactory system provides for certain adaptations that are crucial to the biological needs of mammals. | ||||
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| Notes | Approved | no | |||
| Call Number | refbase @ user @ | Serial | 798 | ||
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| Author | Mitchell R | ||||
| Title | Self-recognition, methodology and explanation: a comment on Heyes (1994) | Type | Journal Article | ||
| Year | 1995 | Publication | Animal Behaviour. | Abbreviated Journal | Anim. Behav. |
| Volume | 51 | Issue | Pages |
467 | |
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| Call Number | Equine Behaviour @ team @ | Serial | 3020 | ||
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| Author | Bateson, M.; Kacelnik, A. | ||||
| Title | Accuracy of memory for amount in the foraging starling,Sturnus vulgaris | Type | Journal Article | ||
| Year | 1995 | Publication | Animal Behaviour. | Abbreviated Journal | Anim. Behav. |
| Volume | 50 | Issue | 2 | Pages |
431-443 |
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| Abstract | Attempts to include psychological constraints in models of foraging behaviour differ in their assumptions concerning the accuracy of estimation of environmental parameters. Psychologists model estimation error as increasing linearly with the magnitude of a stimulus (Weber's Law), whereas behavioural ecologists either ignore error or assume it to be independent of stimulus magnitude. Studies on the estimation of time intervals have confirmed Weber's Law, but there are few data on the accuracy of estimation of amounts of food. Since the currency of most foraging models is the amount of food acquired per unit of time spent foraging, information on estimation of amount is required. Here, a titration method was used in which starlings chose between two cues. One colour signalled a standard food reward, and the other a reward that adjusted in magnitude according to the birds' choices: it increased when the standard was preferred and decreased when the adjusting option was preferred. There were two standards of 3 and 9 units of food, each of which was delivered at two rates to control for possible effects of rate of reinforcement on discrimination. The observed value of the adjusting option oscillated around a mean value slightly larger than that of the standard. The amplitude and period of these oscillations were larger when the standard was larger, independent of the rate of reinforcement. Also, molecular analysis showed that the probability of choosing the currently larger alternative increased as the relative difference between the adjusting option and standard increased. These results are consistent with Weber's Law applying to starlings' memories for amounts of food. | ||||
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| Notes | Approved | no | |||
| Call Number | Serial | 2110 | |||
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| Author | Mesterton-Gibbons, M.; Dugatkin, L.A. | ||||
| Title | Toward a theory of dominance hierarchies: effects of assessment, group size, and variation in fighting ability | Type | Journal Article | ||
| Year | 1995 | Publication | Behavioral Ecology | Abbreviated Journal | Behav. Ecol. |
| Volume | 6 | Issue | 4 | Pages |
416-423 |
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| Abstract | We introduce assessment to the analysis of dominance hierarchies by exploring the effect of an evolutionarily stable fighting rule when there is variation in resource holding potential (RHP) and RHP is not a perfectly reliable predictor of the outcome of a fight. With assessment, the probability of a linear hierarchy decreases with group size but can remain appreciable for groups of up to seven or eight individuals, whereas it decreases virtually to zero if there is no assessment. The probability of a hierarchy that correlates perfectly with RHP is low unless group size is small. | ||||
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| Notes | 10.1093/beheco/6.4.416 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 447 | ||
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| Author | Laughlin N.K.; Lasky R.E.; Luck M.L.; Kluender K.R.; Hecox K.E. | ||||
| Title | Early lead exposure alters behavioral and electrophysiological indices of auditory processing in the rhesus monkey | Type | Journal Article | ||
| Year | 1995 | Publication | Neurotoxicology and Teratology | Abbreviated Journal | |
| Volume | 17 | Issue | Pages |
374-374 | |
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| Call Number | refbase @ user @ | Serial | 3456 | ||
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| Author | VanDierendonck, M.C.; de Vries, H.; Schilder, M.B.H. | ||||
| Title | An Analysis of Dominance, Its Behavioural Parameters and Possible Determinants in a Herd of Icelandic orses in Captivity | Type | Journal Article | ||
| Year | 1995 | Publication | Netherlands Journal of Zoology | Abbreviated Journal | Netherl. J. Zool. |
| Volume | 45 | Issue | 3-4 | Pages |
362-385 |
| Keywords | Dominance; rank order; horses; Icelandic horses. | ||||
| Abstract | Th e applicability of the concept of dominance was investigated in a captive herd of  Icelandic horses and  ponies of diff erent breeds. Eight out of  behaviours possibly related to dominance occurred frequently enough to be investigated in detail. For these eight agonistic behaviours the coverage, the unidirectionality in the exchange, and the degree of transitivity (Landau`s linearity index) were calculated. Four off ensive behaviours, together with avoidance, were suitable for further analysis with regard to dominance. Th e patterns of asymmetries with which these behaviours were exchanged were suffi ciently similar as to justify the application of the dominance concept and to construct a (nearly) linear dominance hierarchy. Th e rank order of the castrated stallions was completely linear, the hierarchy of the mares was almost completely linear. Th e results suggest that off ensive and defensive aggressive behaviours should be treated separately and that the concept of dominance is applicable. However, ritualized formal dominance signals between adult horses appear to be (almost) absent. Th e rank positions of the individuals were correlated with age and residency in the herd but not with height. Middle ranking horses tended to be more frequently in the close vicinity of another horse than high ranking or low ranking horses. Over and above this correlation at the individual level, it was found that pairs of horses close in rank to each other were more often also spatially close to each other. Being in oestrus did not infl uence the dominance relationships between mares. For castrated stallions the rank positions were correlated with the age at which they were castrated. Th is suggests that in male horses experience prior to neutering infl uences the behaviour afterwards. |
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| Language | English | Summary Language | Original Title | ||
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| Notes | Approved | no | |||
| Call Number | refbase @ user @ | Serial | 440 | ||
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| Author | VanDierendonck, M.C., de Vries, H., Schilder, M.B.H. | ||||
| Title | An Analysis of Dominance, Its Behavioural Parameters and Possible Determinants in a Herd of Icelandic horses in captivity | Type | Journal Article | ||
| Year | 1995 | Publication | Netherlands Journal of Zoology | Abbreviated Journal | Netherl. J. Zool. |
| Volume | 45 | Issue | 3-4 | Pages |
362-385 |
| Keywords | Dominance; rank order; horses; Icelandic horses. | ||||
| Abstract | Feral horses are social animals, which have to rely on survival strategies centered on the formation of cohesive social bonds within their bands. Many problems in the husbandry of social animals such as horses, are due to the fact that the limits of their adaptive abilities are exceeded. Evidence suggests that the fundamental social characteristics of domestic horses have remained relatively unchanged. The social structure, social strategies and social interactions were investigated (3 non-consecutive years, 24 hr per day for several weeks) in long term established groups of domestic horses (mares and geldings of all ages) and a few small introduced groups, kept in (semi)natural environments. The general aim was to investigate the social needs of domestic horses. The social life of domestic horses was characterised by long lasting bonds with preferred partners which were established and maintained by allogrooming, play, proximity and dominance behaviours. Bonding partners were mainly found within the same sex-age group, but adult geldings also bonded with sub-adult mares and geldings. Adult mares were clustered in a group, while the other animals formed a second group. Among the adult mares, subgroups according to reproductive state were formed. Individuals regulated their social network by interfering with interactions between other members of the herd, which in itself is complex. An intervention is a behavioural action of one animal that actively interferes with an ongoing interaction between a dyad with the apparent aim of altering that interaction. This was verified by post-hoc analyses of disturbed and undisturbed interactions. Interventions in allogrooming or play were performed significantly more often when at least one member of the initial dyad was a preferred partner of, or familiar to (within the small introduced bands) the intervener. The stronger the preferred association in allogrooming between the intervener and member(s) of the initial dyad, the higher the probability the intervener would displace one initial member and continue allogrooming with the other. Just five behaviours were extracted which reliably reflected the dominance relations among horses. Aggression with the hind quarters was used both offensively and defensively and therefore not suitable as a reliable parameter. Individual dominance relationships were related to social experience. The implications of these findings for horse husbandry were assessed. It is argued that the execution of affiliative behaviours may be rewarding in itself, and therefore always will be a highly motivated behaviour. It is shown that social positive physical interactions (allogrooming, play) with other horses is an ethological need and therefore indispensable in modern husbandry systems. Ethological needs are so important for the animal that husbandry systems that lack the possibilities to execute such behaviours will cause chronic stress. It is concluded that all horses need physical social contact, and that horses, which lack appropriate social learning experiences during ontogeny, may be hampered in their social functioning later in life. Solutions for problems, including dominance problems, in individual social housing and group housing are presented. | ||||
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| Call Number | Equine Behaviour @ team @ | Serial | 2368 | ||
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| Author | Skandakumar, S.; Stodulski, G.; Hau, J. | ||||
| Title | Salivary IgA: a Possible Stress Marker In Dogs | Type | Abstract | ||
| Year | 1995 | Publication | Animal Welfare | Abbreviated Journal | |
| Volume | 4 | Issue | 4 | Pages |
339-350 |
| Keywords | Animal Welfare; Behaviour; Cortisol; Dog; Salivary Iga (S-Iga); Stress; Well-Being | ||||
| Abstract | Stress in humans has been reported to be associated with a decrease in the salivary immunoglobulin A (s-IgA) levels enabling the possible use of s-IgA to assess stress. Prolonged stress, if reliably assessed in a non-invasive manner, may be used to assess animal welfare. This study analysed groups of dogs undergoing physical and temperamental training and s-IgA levels were measured by rocket immunoelectrophoresis in prospective samples. Behavioural assessment was carried out and cortisol levels in saliva were measured by ELISA. A significant negative correlation (P < 0.007) between the logarithmic cortisol concentrations and s-IgA levels in saliva was recorded. The behavioural assessment of the dogs agreed well with the biochemical markers. It is concluded that IgA levels in saliva may be a useful marker of dog well-being and that stress results in decreased s-IgA levels. | ||||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5964 | ||
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