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Oakenfull, E.A.; Ryder, O.A. |
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Title |
Mitochondrial control region and 12S rRNA variation in Przewalski's horse (Equus przewalskii) |
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Journal Article |
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Year |
1998 |
Publication |
Animal Genetics |
Abbreviated Journal  |
Anim Genet |
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Volume |
29 |
Issue |
6 |
Pages |
456-459 |
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Keywords |
Animals; DNA, Mitochondrial/*genetics; Female; *Genetic Variation; Horses/*genetics; Male; Pedigree; RNA, Ribosomal/*genetics |
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Abstract |
Variation in the control region and the 12S rRNA gene of all surviving mitochondrial lineages of Przewalski's horse was investigated. Variation is low despite the present day population being descended from 13 individuals probably representing animals from three different regions of its range. Phylogenetic comparison of these sequences, with sequences for the domestic horse, does not resolve the ancestral status of either horse. |
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Center for Reproduction of Endangered Species, Zoological Society of San Diego, CA 92112, USA |
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0268-9146 |
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PMID:9883508 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
5040 |
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Author |
Chilton, N.B. |
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Title |
The use of nuclear ribosomal DNA markers for the identification of bursate nematodes (order Strongylida) and for the diagnosis of infections |
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Journal Article |
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Year |
2004 |
Publication |
Animal Health Research Reviews / Conference of Research Workers in Animal Diseases |
Abbreviated Journal |
Anim Health Res Rev |
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Volume |
5 |
Issue |
2 |
Pages |
173-187 |
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Keywords |
Animals; Birds; Cats; DNA Primers; DNA, Helminth/*analysis; DNA, Ribosomal/*analysis; Dogs; Horses; Molecular Diagnostic Techniques/veterinary; Ruminants; Strongylida/*genetics; Strongylida Infections/diagnosis/*veterinary |
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Abstract |
Many bursate nematodes are of major importance to animal health. Animals are often parasitized by multiple species that differ in their prevalence, relative abundance and/or pathogenicity. Implementation of effective management strategies for these parasites requires reliable methods for their detection in hosts, identification to the species level and measurement of intensity of infection. One major problem is the difficulty of accurately identifying and distinguishing many species of bursate nematode because of the remarkable morphological similarity of their eggs and larvae. The inability to identify, with confidence, individual nematodes (irrespective of their life-cycle stage) to the species level by morphological methods has often led to a search for species-specific genetic markers. Studies over the past 15 years have shown that sequences of the internal transcribed spacers of ribosomal DNA provide useful genetic markers, providing the basis for the development of PCR-based diagnostic tools. Such molecular methods represent powerful tools for studying the systematics, epidemiology and ecology of bursate nematodes and, importantly, for the specific diagnosis of infections in animals and humans, thus contributing to improved control and prevention strategies for these parasites. |
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Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada. neil.chilton@usask.ca |
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1466-2523 |
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PMID:15984323 |
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Call Number |
Equine Behaviour @ team @ |
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2628 |
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Author |
Henderson, J.V.; Warant, N.K. |
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Title |
Reducing Equine Stereotypies Using an Equiball |
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Journal Article |
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Year |
2001 |
Publication |
Animal Welfare |
Abbreviated Journal |
Anim Welfare |
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Volume |
10 |
Issue |
1 |
Pages |
73-80 |
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Keywords |
NIMAL WELFARE; ENRICHMENT; EQUIBALLTRADE; HORSES; STEREOTYPIC BEHAVIOUR |
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Abstract |
It is believed that environmental enrichment techniques can play an important part in creating suitable captive environments for horses. There has, however, been little scientific investigation into the effectiveness of 'stable-toys' which claim to reduce the performance of equine stereotypies. This study investigated the effect of a foraging device known as 'The Equiball' on equine stereotypies. Six horses were given their evening feed in an Equiball, and the occurence of stereotypic behaviour recorded using scan sampling of video observations. Pre-enrichment, horses spent a mean(SD) of 5.27 ? 8.17 per cent of their time in the stable performing stereotypies; and significant individual variation in mean time performing stereotypic behaviour was found (P < 0.05). Several peaks in stereotypy over the day were found, the two main ones corresponding to the times before feeding. A reduction in stereotypic behaviour in five horses, and a small increase in stereotypic behaviour in one horse was observed during enrichment. During enrichment, there was an overall trend for stereotypic behaviour to decrease (P < 0.1). When used in conjunction with other measures such as behaviour therapy, companionship, increased exercise, and so on, the Equiball may help to create an environment less likely to lead to the development of stereotypic behaviours. |
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refbase @ user @ |
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2011 |
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Author |
Uller, C.; Lewis, J. |
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Title |
Horses (Equus caballus) select the greater of two quantities in small numerical contrasts |
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Journal Article |
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Year |
2009 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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Volume |
12 |
Issue |
5 |
Pages |
733-738 |
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Keywords |
Quantity representation – Horses – Number discrimination |
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Abstract The ability to select the greater numerosity over another in small sets seems to stem from the calculation of which set contains more, and has been taken as evidence of a primordial representation at the roots of the primate numerical system. We tested 56 horses (Equus caballus) in a paradigm previously used with human infants and nonhuman primates. Horses saw two quantities paired in contrasts—2 versus 1, 3 versus 2, 6 versus 4 and a control for volume, 2 versus 1 big—and had to make a choice by snout touching the container holding the numerosity selected. The horses spontaneously selected the greater of the two quantities when the numerosities were small. These results add to evidence showing spontaneous quantity assessment in a variety of species. |
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Equine Behaviour @ team @ |
Serial |
5028 |
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Author |
Osthaus, B.; Proops, L.; Hocking, I.; Burden, F. |
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Title |
Spatial cognition and perseveration by horses, donkeys and mules in a simple A-not-B detour task |
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Journal Article |
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Year |
2013 |
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Abbreviated Journal |
Animal Cognition |
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Volume |
16 |
Issue |
2 |
Pages |
301-305 |
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Keywords |
Equids; Donkeys; Horses; Mules; Dogs; Detour; Spatial reasoning; A-not-B; Perseveration |
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We investigated perseveration and detour behaviour in 36 equids (Equus caballus, E. asinus, E. caballus × E. asinus) and compared these data to those of a previous study on domestic dogs (Canis familiaris). The animals were required to make a detour through a gap at one end of a straight barrier in order to reach a visible target. After one, two, three or four repeats (A trials), the gap was moved to the opposite end of the barrier (B trials). We recorded initial deviations from the correct solution path and the latency to crossing the barrier. In the A trials, mules crossed the barrier significantly faster than their parental species, the horses and donkeys. In the B trials, following the change of gap location, all species showed a reduction in performance. Both dogs and horses exhibited significant spatial perseveration, going initially to the previous gap location. Donkeys and mules, however, performed at chance level. Our results suggest that hybrid vigour in mules extends to spatial abilities. |
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Springer-Verlag |
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English |
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1435-9448 |
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Equine Behaviour @ team @ |
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5694 |
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Author |
Wolter, R.; Stefanski, V.; Krueger, K. |
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Title |
Parameters for the Analysis of Social Bonds in Horses |
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Journal Article |
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Year |
2018 |
Publication |
Animals |
Abbreviated Journal |
Animals |
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Volume |
8 |
Issue |
11 |
Pages |
191 |
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Keywords |
feral horses; mutual grooming; social bonds; social bond analysis; spatial proximity |
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Abstract |
Social bond analysis is of major importance for the evaluation of social relationships in group housed horses. However, in equine behaviour literature, studies on social bond analysis are inconsistent. Mutual grooming (horses standing side by side and gently nipping, nuzzling, or rubbing each other), affiliative approaches (horses approaching each other and staying within one body length), and measurements of spatial proximity (horses standing with body contact or within two horse-lengths) are commonly used. In the present study, we assessed which of the three parameters is most suitable for social bond analysis in horses, and whether social bonds are affected by individual and group factors. We observed social behaviour and spatial proximity in 145 feral horses, five groups of Przewalski�s horses (N = 36), and six groups of feral horses (N = 109) for 15 h per group, on three days within one week. We found grooming, friendly approaches, and spatial proximity to be robust parameters, as their correlation was affected only by the animals� sex (GLMM: N = 145, SE = 0.001, t = �2.7, p = 0.008) and the group size (GLMM: N = 145, SE < 0.001, t = 4.255, p < 0.001), but not by the horse breed, the aggression ratio, the social rank, the group, the group composition, and the individuals themselves. Our results show a trend for a correspondence between all three parameters (GLMM: N = 145, SE = 0.004, t = 1.95, p = 0.053), a strong correspondence between mutual grooming and friendly approaches (GLMM: N = 145, SE = 0.021, t = 3.922, p < 0.001), and a weak correspondence between mutual grooming and spatial proximity (GLMM: N = 145, SE = 0.04, t = 1.15, p = 0.25). We therefore suggest either using a combination of the proactive behaviour counts mutual grooming and friendly approaches, or using measurements of close spatial proximity, for the analysis of social bonds in horses within a limited time frame. |
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2076-2615 |
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Equine Behaviour @ team @ |
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6428 |
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Author |
Sigurjónsdóttir, H.; Haraldsson, H. |
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Title |
Significance of Group Composition for the Welfare of Pastured Horses |
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Journal Article |
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Year |
2019 |
Publication |
Animals |
Abbreviated Journal |
Animals |
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9 |
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14 |
Pages |
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Keywords |
horse welfare; aggression; allogrooming; pastured horses; Icelandic horse |
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We explore how herd composition and management factors correlate with frequencies of social interactions in horse groups. Since the welfare of horses correlates with low aggression levels and social contact opportunities, information of this kind is important. The data are a collection of records of social interactions of 426 Icelandic horses in 20 groups of at least eight horses. The complexities and limitations of the data prohibit useful statistical modelling so the results are presented descriptively. Interesting and informative patterns emerge which can be of use both in management and in future studies. Of special interest are the low levels of agonistic behaviours in breeding groups where one stallion was present. The horses were less agonistic when in groups with young foals and where group membership was stable. Unfamiliar yearlings in peer groups were especially aggressive. Allogrooming was most frequent in groups with relatively more young horses and in unstable and small groups. Interestingly, the horses allogroomed more if they had few preferred allogrooming partners. The findings show that composition (age/sex) and stability of groups are of great importance with respect to aggression levels and opportunities for establishing bonds. |
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Animals |
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9 |
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1 |
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2076-2615 |
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Equine Behaviour @ team @ |
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6510 |
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Author |
Sigurjónsdóttir, H.; Haraldsson, H. |
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Title |
Significance of Group Composition for the Welfare of Pastured Horses |
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Journal Article |
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Year |
2018 |
Publication |
Animals |
Abbreviated Journal |
Animals |
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9 |
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1 |
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14 |
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Keywords |
horse welfare; aggression; allogrooming; pastured horses; Icelandic horse |
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Simple Summary
Because of their social nature, horses need to have plenty of opportunities to interact with others to establish bonds and learn from their elders. Comparison of social behaviour of 426 horses in 20 groups of Icelandic horses in pastures, showed that aggression was lowest where the group composition was like the natural system, i.e., with a stallion, mares and their young foals. In groups without a stallion, the presence of foals is also associated with low aggression. Stability of the group with respect to group composition is of great importance; the horses are less aggressive in the more stable groups. The highest aggression was found in groups of unfamiliar yearlings. The horses allogroomed more in groups with relatively more young horses, which suggests they are forming bonds. Later, they groom less but prefer certain individuals. Horse owners should all be aware of the importance of planning the composition of horse groups and to keep the membership as stable as possible in order to ensure good welfare.
Abstract
We explore how herd composition and management factors correlate with frequencies of social interactions in horse groups. Since the welfare of horses correlates with low aggression levels and social contact opportunities, information of this kind is important. The data are a collection of records of social interactions of 426 Icelandic horses in 20 groups of at least eight horses. The complexities and limitations of the data prohibit useful statistical modelling so the results are presented descriptively. Interesting and informative patterns emerge which can be of use both in management and in future studies. Of special interest are the low levels of agonistic behaviours in breeding groups where one stallion was present. The horses were less agonistic when in groups with young foals and where group membership was stable. Unfamiliar yearlings in peer groups were especially aggressive. Allogrooming was most frequent in groups with relatively more young horses and in unstable and small groups. Interestingly, the horses allogroomed more if they had few preferred allogrooming partners. The findings show that composition (age/sex) and stability of groups are of great importance with respect to aggression levels and opportunities for establishing bonds. |
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Equine Behaviour @ team @ |
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6585 |
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Author |
Shalaby, A.M. |
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Title |
Host-preference observations on Anopheles culicifacies (Diptera: Culicidae) in Gujarat State, India |
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Journal Article |
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1969 |
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Annals of the Entomological Society of America |
Abbreviated Journal |
Ann Entomol Soc Am |
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62 |
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6 |
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1270-1273 |
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Keywords |
Animals; *Anopheles; Cattle; *Ddt; Dogs; Ecology; Female; Goats; Horses; Humans; India; *Insect Vectors; *Insecticide Resistance; Precipitin Tests; Sheep |
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0013-8746 |
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PMID:5374165 |
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Equine Behaviour @ team @ |
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2739 |
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Author |
Pichardo, M. |
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Title |
Valsequillo biostratigraphy. III: Equid ecospecies in Paleoindian sites |
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Journal Article |
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Year |
2000 |
Publication |
Anthropologischer Anzeiger; Bericht Uber die Biologisch-Anthropologische Literatur |
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Anthropol Anz |
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58 |
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3 |
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275-298 |
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Animals; *Ecology; Horses/*classification; Mexico; *Paleodontology; Species Specificity |
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Greater precision in North American Pleistocene equid taxonomy makes it now possible to exploit the ubiquitous horse remains in Paleoindian sites as ecological index-fossils. The horses of Central Mexico and the Southern Plains can be sorted by tooth size alone, except for two rare large horses of the Southern Plains. The species endemic to these grasslands and south to Central Mexico are Equus pacificus (large), E. conversidens (small), E. francisci (smallest). The Southern Plains were also occupied by a specialized grazer E. excelsus (Burnet and Sandia caves) and E. occidentalis (Dry and Sandia caves). West of the Rocky Mountains E. occidentalis was dominant. East of the Mississippi River two woodland species are found: E. fraternus and E. littoralis. |
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0003-5548 |
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PMID:11082786 |
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Equine Behaviour @ team @ |
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2648 |
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