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| Author | Sanchez-Vizcaino, J.M. | ||||
| Title | Control and eradication of African horse sickness with vaccine | Type | Journal Article | ||
| Year | 2004 | Publication | Developments in Biologicals | Abbreviated Journal | Dev Biol (Basel) |
| Volume | 119 | Issue | Pages | 255-258 | |
| Keywords | African Horse Sickness/epidemiology/*prevention & control; African horse sickness virus/immunology; Animals; Disease Outbreaks/veterinary; Equidae/*virology; Horses; Insect Control; Insect Vectors/virology; Spain/epidemiology; Viral Vaccines/*administration & dosage | ||||
Abstract  |
African horse sickness (AHS) is an infectious but no-contagious viral disease of equidae with high mortality in horses. The disease is caused by an arthropod-borne double-stranded RNA virus within the genus Orbivirus of the family Reoviridae transmitted by at least two species of Culicoides. Nine different serotypes have been described. The nine serotypes of AHS have been described in eastern and southern Africa. Only AHS serotypes 9 and 4 have been found in West Africa from where they occasionally spread into countries surrounding the Mediterranean. Examples of outbreaks that have occurred outside Africa are: in the Middle East (1959-1963), in Spain (serotype 9, 1966, serotype 4, 1987-1990), and in Portugal (serotype 4, 1989) and Morocco (serotype 4, 1989-1991). Laboratory diagnosis of AHS is essential. Although the clinical signs and lesions are characteristic, they can be confused with those of other diseases. Several techniques have been adapted for the detection of RNA segments, antibodies and antigen. Two types of vaccines have been described for AHS virus. Attenuated live vaccines (monovalent and polyvalent) for use in horses, mules and donkeys, are currently available, as well as a monovalent, serotype 4, inactivated vaccine, produced commercially but no longer available. New vaccines, including a subunit vaccine, have been evaluated experimentally. In this paper a review of the last AHS outbreaks in Spain, occurring during 1987-1990, and affecting the central and south part of the country, is presented. The role that vaccination played for the control and eradication of the disease, as well as other aspects such as climatological conditions, number of vectors and horse management, are also presented and evaluated. | ||||
| Address | Facultad de Veterinaria, Universidad Complutense, Madrid, Spain. jmvizcaino@vet.ucm.es | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 1424-6074 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | PMID:15742636 | Approved | no | ||
| Call Number | Equine Behaviour @ team @ | Serial | 2357 | ||
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| Author | Fortes, A.F.; Merchant, H.; Georgopoulos, A.P. | ||||
| Title | Comparative and categorical spatial judgments in the monkey: “high” and “low” | Type | Journal Article | ||
| Year | 2004 | Publication | Animal Cognition | Abbreviated Journal | Anim. Cogn. |
| Volume | 7 | Issue | 2 | Pages | 101-108 |
| Keywords | Animals; *Classification; Cognition; *Discrimination Learning; Form Perception; Macaca mulatta/*parasitology; Male; *Pattern Recognition, Visual; Semantics; *Space Perception | ||||
| Abstract |
Adult human subjects can classify the height of an object as belonging to either of the “high” or “low” categories by utilizing an abstract concept of midline that divides the vertical dimension into two halves. Children lack this abstract concept of midline, do not have a sense that these categories are directional opposites, and their categorical and comparative usages of high(er) or low(er) are restricted to the corresponding poles. We investigated the abilities of a rhesus monkey to perform categorical judgments in space. We were also interested in the presence of the congruity effect (a decrease in response time when the objects compared are closer to the category pole) in the monkey. The presence of this phenomenon in the monkey would allow us to relate the behavior of the animal to the two major competing hypotheses that have been suggested to explain the congruity effect in humans: the analog and semantic models. The monkey was trained in delayed match-to-sample tasks in which it had to categorize objects as belonging to either a high or low category. The monkey was able to generate an abstract notion of midline in a fashion similar to that of adult human subjects. The congruity effect was also present in the monkey. These findings, taken together with the notion that monkeys are not considered to think in propositional terms, may favor an analog comparison model in the monkey. | ||||
| Address | Brain Sciences Center, Veterans Affairs Medical Center, One Veterans Drive, Minneapolis, MN 55417, USA | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 1435-9448 | ISBN | Medium | ||
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| Notes | PMID:15069609 | Approved | no | ||
| Call Number | Equine Behaviour @ team @ | Serial | 2531 | ||
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| Author | Sands, J.; Creel, S. | ||||
| Title | Social dominance, aggression and faecal glucocorticoid levels in a wild population of wolves, Canis lupus | Type | Journal Article | ||
| Year | 2004 | Publication | Animal Behaviour. | Abbreviated Journal | Anim. Behav. |
| Volume | 67 | Issue | 3 | Pages | 387-396 |
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| Abstract |
Adrenal glucocorticoid (GC) secretion is an important component of the response to stress in vertebrates. A short-term increase in circulating GCs serves to redirect energy from processes that can be briefly curtailed without harm, allowing energy to be directed towards eliminating or avoiding the stressor. In contrast, prolonged elevation of GCs can cause a broad range of pathologies, including reproductive suppression. We examined whether social subordination in wolves leads to chronically elevated GC levels, and whether this [`]social stress' causes reproductive suppression of subordinates in cooperatively breeding species. Behavioural and endocrine data collected over 2 years from three packs of free-living wolves in Yellowstone National Park did not support this hypothesis. GC levels were significantly higher in dominant wolves than in subordinates, for both sexes, in all packs, in both years of study. Unlike other cooperatively breeding carnivores (e.g. dwarf mongooses, Helogale parvula, and African wild dogs, Lycaon pictus), high GCs in dominant wolves were not associated with high rates of aggression or agonistic interaction. Aggression increased for wolves of all ranks during mating periods, accompanied by a significant rise in GC levels. If chronic elevation of GCs carries fitness costs, then social stress in wolves (and many other social species) is a cost of dominance, not a consequence of subordination. The specific behavioural correlates of dominance that affect GC levels appear to vary among species, even those with similar social systems. | ||||
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| ISSN | 0003-3472 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5222 | ||
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| Author | Bugnyar, T.; Kotrschal, K. | ||||
| Title | Leading a conspecific away from food in ravens ( Corvus corax)? | Type | Journal Article | ||
| Year | 2004 | Publication | Animal Cognition | Abbreviated Journal | Anim. Cogn. |
| Volume | 7 | Issue | 2 | Pages | 69-76 |
| Keywords | Misleading – Deception – Raven – Social foraging | ||||
| Abstract |
Active misleading of conspecifics has been described as a social strategy mainly for primates. Here we report a raven leading a competitor away from food in a social foraging task. Four individuals had to search and compete for hidden food at color-marked clusters of artificial food caches. At the beginning of the experiment, a subordinate male found and exploited the majority of the food. As a result, the dominant male displaced him from the already opened boxes. The subordinate male then developed a pattern, when the loss of reward to the dominant got high, of moving to unrewarded clusters and opening boxes there. This diversion often led the dominant to approach those unrewarded clusters and the subordinate then had a head start for exploiting the rewarded boxes. Subsequently, however, the dominant male learned not to follow the subordinate to unrewarded clusters and eventually started searching for the reward himself. These interactions between the two males illustrate the ravens' potential for deceptively manipulating conspecifics. We discuss under which circumstances ravens might use this capacity. | ||||
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| Notes | Approved | no | |||
| Call Number | Serial | 2080 | |||
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| Author | Zentall, T.R. | ||||
| Title | Action imitation in birds | Type | Journal Article | ||
| Year | 2004 | Publication | Learning & behavior : a Psychonomic Society publication | Abbreviated Journal | Learn Behav |
| Volume | 32 | Issue | 1 | Pages | 15-23 |
| Keywords | Adaptation, Psychological; Animals; *Birds; *Imitative Behavior; Imprinting (Psychology); *Learning; Motivation; Psychological Theory; *Social Environment; *Social Facilitation; Vocalization, Animal | ||||
| Abstract |
Action imitation, once thought to be a behavior almost exclusively limited to humans and the great apes, surprisingly also has been found in a number of bird species. Because imitation has been viewed by some psychologists as a form of intelligent behavior, there has been interest in how it is distributed among animal species. Although the mechanisms responsible for action imitation are not clear, we are now at least beginning to understand the conditions under which it occurs. In this article, I try to identify and differentiate the various forms of socially influenced behavior (species-typical social reactions, social effects on motivation, social effects on perception, socially influenced learning, and action imitation) and explain why it is important to differentiate imitation from other forms of social influence. I also examine some of the variables that appear to be involved in the occurrence of imitation. Finally, I speculate about why a number of bird species, but few mammal species, appear to imitate. | ||||
| Address | Department of Psychology, University of Kentucky, Lexington, Kentucky 40506, USA. zentall@uky.edu | ||||
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| Language | English | Summary Language | Original Title | ||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1543-4494 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | PMID:15161137 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 230 | ||
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| Author | Geisbauer, G.; Griebel, U.; Schmid, A.; Timney, B | ||||
| Title | Brightness discrimination and neutral point | Type | Journal Article | ||
| Year | 2004 | Publication | Canadian Journal of Zoology | Abbreviated Journal | Can. J. Zool |
| Volume | 82 | Issue | 4 | Pages | 660-670 |
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| Abstract |
Abstract: Equine brightness discrimination ability and color discrimination were measured using a two-choice discrimination task. Two Haflinger horses (Equus caballus L., 1758) were trained to discriminate 30 different shades of grey varying from low to high relative brightness. Their ability to distinguish shades of grey was poor, with calculated Weber fractions of 0.42 and 0.45. In addition, a “neutral point” test to determine the dimensionality of color vision was carried out. Three hues of blue-green were tested versus a range of grey targets with brightnesses similar to those of the blue-green targets. A neutral point was found at about 480 nm. Thus, we can conclude that horses possess dichromatic color vision. |
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 3649 | ||
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| Author | Lefebvre, L.; Reader, S.M.; Sol, D. | ||||
| Title | Brains, Innovations and Evolution in Birds and Primates | Type | Journal Article | ||
| Year | 2004 | Publication | Brain, Behavior and Evolution | Abbreviated Journal | Brain. Behav. Evol. |
| Volume | 63 | Issue | 4 | Pages | 233-246 |
| Keywords | Innovation W Brain evolution W Hyperstriatum ventrale W Neostriatum W Isocortex W Birds W Primates W Tool use W Invasion biology | ||||
| Abstract |
Abstract Several comparative research programs have focusedon the cognitive, life history and ecological traits thataccount for variation in brain size. We review one ofthese programs, a program that uses the reported frequencyof behavioral innovation as an operational measureof cognition. In both birds and primates, innovationrate is positively correlated with the relative size of associationareas in the brain, the hyperstriatum ventrale andneostriatum in birds and the isocortex and striatum inprimates. Innovation rate is also positively correlatedwith the taxonomic distribution of tool use, as well asinterspecific differences in learning. Some features ofcognition have thus evolved in a remarkably similar wayin primates and at least six phyletically-independent avianlineages. In birds, innovation rate is associated withthe ability of species to deal with seasonal changes in theenvironment and to establish themselves in new regions,and it also appears to be related to the rate atwhich lineages diversify. Innovation rate provides a usefultool to quantify inter-taxon differences in cognitionand to test classic hypotheses regarding the evolution ofthe brain. |
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| ISSN | 0006-8977 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 4738 | ||
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| Author | Evans, T.A.; Westergaard, G.C. | ||||
| Title | Discrimination of functionally appropriate and inappropriate throwing tools by captive tufted capuchins (Cebus apella) | Type | Journal Article | ||
| Year | 2004 | Publication | Animal Cognition | Abbreviated Journal | Anim. Cogn. |
| Volume | 7 | Issue | 4 | Pages | 255-262 |
| Keywords | Animals; Appetitive Behavior; Cebus/*psychology; Choice Behavior; *Concept Formation; *Discrimination Learning; Female; Male; *Problem Solving; *Psychomotor Performance; Recognition (Psychology) | ||||
| Abstract |
A tool-throwing task was used to test whether capuchin monkeys understand the difference between functionally appropriate and functionally inappropriate tools. A group of monkeys was trained to obtain a sticky treat from a container outside their enclosure using a projectile attached to one end of an anchored line. Subsequently, these monkeys were given choice tests between functional and nonfunctional versions of tools used in training. A different feature of the tool was varied between alternatives in each choice test. The monkeys chose to use functional tools significantly more often than nonfunctional tools in early exposures to each choice test. A second experiment tested whether these subjects, as well as a second group of minimally trained participants, could distinguish between functional and nonfunctional tools that appeared different from those used in training. A new set of design features was varied between tools in these choice tests. All participants continued to choose functional tools significantly more often than nonfunctional tools, regardless of their tool-throwing experience or the novel appearance of the tools. These results suggest that capuchin monkeys, like chimpanzees studied in similar experiments, are sensitive to a variety of functionally relevant tool features. | ||||
| Address | Alpha Genesis Inc., 95 Castle Hall Road, P.O. Box 557, Yemassee, SC 29945, USA. teprimate@islc.net | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 1435-9448 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | PMID:15138849 | Approved | no | ||
| Call Number | Equine Behaviour @ team @ | Serial | 2523 | ||
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| Author | Pinchbeck, G.L.; Clegg, P.D.; Proudman, C.J.; Stirk, A.; Morgan, K.L.; French, N.P. | ||||
| Title | Horse injuries and racing practices in National Hunt racehorses in the UK: the results of a prospective cohort study | Type | Journal Article | ||
| Year | 2004 | Publication | The Veterinary Journal | Abbreviated Journal | |
| Volume | 167 | Issue | 1 | Pages | 45-52 |
| Keywords | Racehorse; Horse; Injury; Cohort; National Hunt | ||||
| Abstract |
A prospective cohort study was conducted on horses starting in hurdle and steeplechase races on six UK racecourses in 2000 and 2001. Trainers or carers were questioned on the horses' pre-race routine and observational data were collected in the stables and parade ring. Some practices were common to many starters, such as withholding food and water before racing whereas other practices, such as schooling frequency, were more variable. There was a total of 2879 starts and a total of 83 injuries or medical events (28.8/1000 starts). The commonest types of injury were tendon/suspensory injuries and lacerations/wounds. Multivariable logistic regression models were used to identify the relationship between predictor variables and the risk of injury. Risk of injury or medical event was associated with distance of the race and weight carried. The risk of injury, excluding medical events, was associated with the speed of the race and foot conformation. | ||||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 3672 | ||
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| Author | Landman, M.A.A.M.; de Blaauw, J.A.; van Weeren, P.R.; Hofland, L.J. | ||||
| Title | Field study of the prevalence of lameness in horses with back problems | Type | Journal Article | ||
| Year | 2004 | Publication | The Veterinary Record | Abbreviated Journal | Vet. Rec. |
| Volume | 155 | Issue | 6 | Pages | 165-168 |
| Keywords | Animals; Back Pain/epidemiology/*veterinary; Case-Control Studies; Horse Diseases/*epidemiology/etiology; Horses; Lameness, Animal/epidemiology; Netherlands/epidemiology; Osteoarthritis/epidemiology/*veterinary; Prevalence; Records/veterinary; Retrospective Studies | ||||
| Abstract |
A population of 805 horses (70 per cent dressage, 20 per cent show jumpers and 10 per cent trotters) with orthopaedic problems was examined for signs of lameness and back problems, irrespective of their original complaints. In the horses with a back problem the prevalence of lameness was 74 per cent, and back problems were diagnosed in 32 per cent of the lame horses. These percentages were significantly higher than those recorded in a control population of 399 horses, of which 20 per cent were lame and 12 per cent had back problems. In the group of horses with orthopaedic problems there was a strong association between lameness and back problems and, in particular, there was a high prevalence of lameness among the horses with back problems. | ||||
| Address | Bodegraven Equine Clinic, Zuidzijde 63, NL-2411 RT Bodegraven, The Netherlands | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0042-4900 | ISBN | Medium | ||
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| Notes | PMID:15357376 | Approved | no | ||
| Call Number | Equine Behaviour @ team @ | Serial | 3717 | ||
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