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Author |
Merl, S.; Scherzer, S.; Palme, R.; Möstl, E. |
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Title |
Pain causes increased concentrations of glucocorticoid metabolites in horse feces |
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Journal Article |
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Year |
2000 |
Publication |
Journal of Equine Veterinary Science |
Abbreviated Journal |
J Equine Vet Sci |
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20 |
Issue |
9 |
Pages |
586-590 |
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Abstract |
The concentration of 11,17-dioxoandrostanes (11,17-DOA), a group of cortisol metabolites, was measured using enzyme immunoassay in fecal samples of horses experiencing painful episodes. One group of horses consisted of 10 stallions castrated (samples were collected daily for 10 days); the other group was made up of 29 horses which were brought to an animal hospital because of signs of colic (samples were collected twice daily for six days). Before castration, median concentrations of 10.5 nmol/kg feces were measured. On days 1 and 2 after castration, median 11,17-DOA values increased up to 26.2 and 50.0 nmol/kg feces, respectively, and decreased thereafter to levels lower than at the beginning of the sampling period. High variations were measured between individual cases of colic. In animals with colic, all horses excreted more than 33 nmol 11,17-DOA/kg feces for various periods. The highest concentration measured was 885 nmol/kg feces. One animal out of the 29 colic horses did not show any clinical signs of pain upon arrival in the hospital. The 11,17-DOA values were below 17 nmol/kg feces in all those samples. From this data we conclude, that the concentration of 11,17-DOA in feces is a parameter for painful situations that have occurred one or two days earlier. |
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0737-0806 |
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Equine Behaviour @ team @ |
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6047 |
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Author |
Silanikove, N. |
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Title |
The physiological basis of adaptation in goats to harsh environments |
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2000 |
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Small Rum Res |
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35 |
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Equine Behaviour @ team @ Silanikove2000 |
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6255 |
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Aldezabal, A.; Garin, I. |
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Title |
Browsing preference of feral goats (Capra hircus L.) in a Mediterranean mountain scrubland |
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Year |
2000 |
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J Arid Env |
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44 |
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Equine Behaviour @ team @ Aldezabal2000 |
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6256 |
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McComb, K.; Moss, C.; Sayialel, S.; Baker, L. |
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Unusually extensive networks of vocal recognition in African elephants |
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2000 |
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Anim Behav |
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59 |
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Equine Behaviour @ team @ McComb2000 |
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6281 |
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Author |
Baker, P.J.; Funk, S.M.; Harris, S.; White, P.C.L. |
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Title |
Flexible spatial organization of urban foxes, Vulpes vulpes, before and during an outbreak of sarcoptic mange |
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Journal Article |
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Year |
2000 |
Publication |
Animal Behaviour |
Abbreviated Journal |
Anim. Behav. |
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Volume |
59 |
Issue |
1 |
Pages |
127-146 |
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The social and spatial organization of urban fox groups prior to and during an outbreak of sarcoptic mange was compared with predictions derived from the resource dispersion hypothesis (RDH). We investigated the availability of three key resources. Neither daytime rest sites nor breeding sites appeared to be limited in availability. The availability of food deliberately supplied by local householders was examined by questionnaire surveys. The daily and weekly amount of food supplied was greatly in excess of the minimum requirements of a pair of foxes, but was consistent between territories. The availability of this food source increased markedly as a result of more people feeding the foxes. In agreement with the RDH, group size prior to the outbreak of mange increased from 2.25 animals (N=4) to 6.57 animals (N=7). Before the outbreak of mange, two territories were divided. Increased scavenge availability on smaller territories may have promoted these changes. Excluding these spatial changes, territories were very stable between years. After the outbreak of mange, group size declined as a direct result of mange-induced mortality. Surviving animals increased their ranges only after neighbouring groups had died out. Ranges did not increase in size in response to a decline in food availability. Nor were the increases in range size associated with the relinquishment of parts of the existing territory. These postmange changes are contrary to the RDH. Three factors may have promoted these changes: the elimination of interstitial space, the forced dispersal of young or future division of the territory. |
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0003-3472 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
6431 |
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Author |
Houpt, K.; Marrow, M.; Seeliger, M. |
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Title |
A preliminary study of the effect of music on equine behavior |
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Journal Article |
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Year |
2000 |
Publication |
Journal of Equine Veterinary Science |
Abbreviated Journal |
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Volume |
20 |
Issue |
11 |
Pages |
691-737 |
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0737-0806 |
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Equine Behaviour @ team @ |
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6633 |
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Author |
Linklater, W.L. |
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Title |
Adaptive explanation in socio-ecology: lessons from the Equidae |
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Journal Article |
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Year |
2000 |
Publication |
Biological Reviews of the Cambridge Philosophical Society |
Abbreviated Journal |
Biol. Rev. |
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75 |
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1 |
Pages |
1-20 |
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*Adaptation, Physiological; Animals; Ecology; Equidae/*physiology; Female; Male; Phylogeny |
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Abstract |
Socio-ecological explanations for intra- and interspecific variation in the social and spatial organization of animals predominate in the scientific literature. The socio-ecological model, developed first for the Bovidae and Cervidae, is commonly applied more widely to other groups including the Equidae. Intraspecific comparisons are particularly valuable because they allow the role of environment and demography on social and spatial organization to be understood while controlling for phylogeny or morphology which confound interspecific comparisons. Feral horse (Equus caballus Linnaeus 1758) populations with different demography inhabit a range of environments throughout the world. I use 56 reports to obtain 23 measures or characteristics of the behaviour and the social and spatial organization of 19 feral horse populations in which the environment, demography, management, research effort and sample size are also described. Comparison shows that different populations had remarkably similar social and spatial organization and that group sizes and composition, and home range sizes varied as much within as between populations. I assess the few exceptions to uniformity and conclude that they are due to the attributes of the studies themselves, particularly to poor definition of terms and inadequate empiricism, rather than to the environment or demography per se. Interspecific comparisons show that equid species adhere to their different social and spatial organizations despite similarities in their environments and even when species are sympatric. Furthermore, equid male territoriality has been ill-defined in previous studies, observations presented as evidence of territoriality are also found in non-territorial equids, and populations of supposedly territorial species demonstrate female defence polygyny. Thus, territoriality may not be a useful categorization in the Equidae. Moreover, although equid socio-ecologists have relied on the socio-ecological model derived from the extremely diverse Bovidae and Cervidae for explanations of variation in equine society, the homomorphic, but large and polygynous, and monogeneric Equidae do not support previous socio-ecological explanations for relationships between body size, mating system and sexual dimorphism in ungulates. Consequently, in spite of the efforts of numerous authors during the past two decades, functional explanations of apparent differences in feral horse and equid social and spatial organization and behaviour based on assumptions of their current utility in the environmental or demographic context remain unconvincing. Nevertheless, differences in social cohesion between species that are insensitive to intra- and interspecific variation in habitat and predation pressure warrant explanation. Thus, I propose alternative avenues of inquiry including testing for species-specific differences in inter-individual aggression and investigating the role of phylogenetic constraints in equine society. The Equidae are evidence of the relative importance of phylogeny and biological structure, and unimportance of the present-day environment, in animal behaviour and social and spatial organization. |
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Institute of Natural Resources, Massey University, Palmerston North, New Zealand |
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1464-7931 |
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Notes |
PMID:10740891 |
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2024 |
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Author |
de Waal, F.B.; Aureli, F.; Judge, P.G. |
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Title |
Coping with crowding |
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Journal Article |
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Year |
2000 |
Publication |
Scientific American |
Abbreviated Journal |
Sci Am |
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Volume |
282 |
Issue |
5 |
Pages |
76-81 |
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*Adaptation, Psychological; Animals; Behavior, Animal; Emotions; Female; Grooming; Homicide; Humans; Macaca mulatta; Male; Pan troglodytes; *Population Density; Primates; Rodentia; Rural Population; Territoriality; Urban Population; Violence |
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Living Links Center, Yerkes Regional Primate Research Center, Atlanta, USA |
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0036-8733 |
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PMID:11056991 |
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refbase @ user @ |
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184 |
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Author |
Fischer, J.; Cheney, D.L.; Seyfarth, R.M. |
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Title |
Development of infant baboons' responses to graded bark variants |
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Journal Article |
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Year |
2000 |
Publication |
Proceedings. Biological sciences / The Royal Society |
Abbreviated Journal |
Proc Biol Sci |
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Volume |
267 |
Issue |
1459 |
Pages |
2317-2321 |
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*Animal Communication; Animals; Behavior, Animal; Female; Male; Models, Psychological; Papio/growth & development/*physiology; *Vocalization, Animal |
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Abstract |
We studied the development of infant baboons' (Papio cynocephalus ursinus) responses to conspecific 'barks' in a free-ranging population in the Okavango Delta, Botswana. These barks grade from tonal, harmonically rich calls into calls with a more noisy, harsh structure. Typically, tonal variants are given when the signaller is at risk of losing contact with the group or a particular individual ('contact barks'), whereas harsh variants are given in response to predators ('alarm barks'). We conducted focal observations and playback experiments in which we presented variants of barks recorded from resident adult females. By six months of age, infants reliably discriminated between typical alarm and contact barks and they responded more strongly to intermediate alarm calls than to typical contact barks. Infants of six months and older also recognized their mothers by voice. The ability to discriminate between different call variants developed with increasing age. At two and a half months of age, infants failed to respond at all, whereas at four months they responded irrespective of the call type that was presented. At six months, infants showed adult-like responses by responding strongly to alarm barks but ignoring contact barks. We concluded that infants gradually learn to attach the appropriate meaning to alarm and contact barks. |
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Department of Psychology, University of Pennsylvania, 3815 Walnut Street, Philadelphia, PA 19104, USA. fischerj@eva.mpg.de |
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0962-8452 |
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PMID:11413649 |
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refbase @ user @ |
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694 |
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Author |
Madigan, J.E.; Whittemore, J. |
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Title |
The role of the equine practitioner in disasters |
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Journal Article |
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Year |
2000 |
Publication |
Journal of the American Veterinary Medical Association |
Abbreviated Journal |
J Am Vet Med Assoc |
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Volume |
216 |
Issue |
8 |
Pages |
1238-1239 |
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*Animal Husbandry/education; *Animal Welfare; Animals; Disaster Planning; *Horses; *Natural Disasters; United States; *Veterinary Medicine |
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Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California-Davis 95616, USA |
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0003-1488 |
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PMID:10767959 |
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Equine Behaviour @ team @ |
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4055 |
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