A genetic study of summer eczema in Icelandic horses
Several horse breeds around the world have shown sensitivity to biting insects. The horses seem to be particularly sensitive to certain species of the genus Culicoides. The main reaction to the insects' bites is itchiness and some horses itch until wounds appear. In Sweden and the rest of Europe man...
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| Formato: | Otro |
| Lenguaje: | sueco Inglés |
| Publicado: |
2006
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| Acceso en línea: | https://stud.epsilon.slu.se/11078/ |
| _version_ | 1855571803877933056 |
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| author | Lindberg, Louise |
| author_browse | Lindberg, Louise |
| author_facet | Lindberg, Louise |
| author_sort | Lindberg, Louise |
| collection | Epsilon Archive for Student Projects |
| description | Several horse breeds around the world have shown sensitivity to biting insects. The horses seem to be particularly sensitive to certain species of the genus Culicoides. The main reaction to the insects' bites is itchiness and some horses itch until wounds appear. In Sweden and the rest of Europe many breeds have been observed to have the problem and as regards Icelandic horses this phenomena is widely discussed. It has been shown that horses exported from Iceland to continental Europe as adults have higher disease prevalence. These horses have less chance to develop a normal immune defense to Culicoides, since no Culicoides have been found in Iceland. Nevertheless, a certain proportion of Icelandic horses born outside Iceland are also affected by the disease, which in Sweden is known as summer eczema.
The aim of this study was to estimate genetic parameters for severity of summer eczema in Icelandic horses born in Sweden. The study is based on information from a questionnaire sent to owners of Icelandic horse in Sweden during the summer of 2005, with questions regarding the status of their horses' eczema. The questionnaire was sent to owners of Swedish born horses after 33 selected stallions. The result is based on the information about 825 horses.
A total of 8 % of the Swedish born horses were affected with summer eczema. Affected dams were more likely to have offspring with eczema, compared with healthy dams. The heritability was estimated at 0.20 ± 0.1 using a sire model and at 0.19 ± 0.1 using an animal model. The fixed effects included in the model were age and geographic location of the horse at present time. Age did not seem to be of significance (p>0.05) for the trait, whereas geographic location on the other hand showed to be significant (p< 0.05) for whether the horse develops eczema or not. |
| format | Otro |
| id | RepoSLU11078 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish Inglés |
| publishDate | 2006 |
| publishDateSort | 2006 |
| record_format | eprints |
| spelling | RepoSLU110782017-09-29T09:38:03Z https://stud.epsilon.slu.se/11078/ A genetic study of summer eczema in Icelandic horses Lindberg, Louise Animal genetics and breeding Several horse breeds around the world have shown sensitivity to biting insects. The horses seem to be particularly sensitive to certain species of the genus Culicoides. The main reaction to the insects' bites is itchiness and some horses itch until wounds appear. In Sweden and the rest of Europe many breeds have been observed to have the problem and as regards Icelandic horses this phenomena is widely discussed. It has been shown that horses exported from Iceland to continental Europe as adults have higher disease prevalence. These horses have less chance to develop a normal immune defense to Culicoides, since no Culicoides have been found in Iceland. Nevertheless, a certain proportion of Icelandic horses born outside Iceland are also affected by the disease, which in Sweden is known as summer eczema. The aim of this study was to estimate genetic parameters for severity of summer eczema in Icelandic horses born in Sweden. The study is based on information from a questionnaire sent to owners of Icelandic horse in Sweden during the summer of 2005, with questions regarding the status of their horses' eczema. The questionnaire was sent to owners of Swedish born horses after 33 selected stallions. The result is based on the information about 825 horses. A total of 8 % of the Swedish born horses were affected with summer eczema. Affected dams were more likely to have offspring with eczema, compared with healthy dams. The heritability was estimated at 0.20 ± 0.1 using a sire model and at 0.19 ± 0.1 using an animal model. The fixed effects included in the model were age and geographic location of the horse at present time. Age did not seem to be of significance (p>0.05) for the trait, whereas geographic location on the other hand showed to be significant (p< 0.05) for whether the horse develops eczema or not. Studier har visat att flera hästraser runt om i världen uppvisar en överkänslighet mot bitande insekter. Hästar har visat sig var mer känsliga mot vissa specifika insekter än andra. Culicoides är ett av de släkten som är mycket omskrivet då det gäller denna överkänslighet hos häst. Reaktionen mot insekterna visar sig i huvudsak som klåda, vilket kan leda till att hästarna kliar sönder sin hud och sår kan uppkomma. I Sverige och i övriga Europa har detta uppmärksammats hos flera raser och vad gäller Islandshästen är det mycket omdiskuterat. Det har visat sig att de hästar som exporterats från Island i vuxen ålder har en högre sjukdomsprevalens då de inte har haft någon chans att bygga upp ett immunförsvar mot insekten eftersom denna inte förekommer på Island. Även en viss andel av hästar födda utanför Island är drabbade av sjukdomen, som i Sverige benämns som sommareksem. Målet med denna studie var att skatta genetiska parametrarna för graden av sommareksem hos svenskfödda islandshästar i Sverige. Denna studie bygger på enkätsvar som samlats in från islandshästägare i Sverige under sommaren 2005. Enkäten sändes ut till ägare till svenskfödda avkommor efter 33 utvalda hingstar. Resultatet bygger på information om 825 hästar. Totalt 8% av hästarna var drabbade av sommareksem. Ston med eksem hade en högre andel avkommor som också var drabbade av eksem, jämfört med friska ston. Arvbarheten skattades till 0,20 ± 0,1 med en far modell och 0,19 ± 0,1 med en djurmodell. De fixa effekterna som användes i modellen var hästen ålder och hästens geografiska lokalisering i landet. Ålder hade ingen signifikant betydelse (p> 0,05) medan hästens lokalisering tycks vara av betydelse (p< 0,05) för om hästen utvecklar eksem eller inte. 2006-10-11 Other NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/11078/1/lindberg_l_170929.pdf Lindberg, Louise, 2006. A genetic study of summer eczema in Icelandic horses. UNSPECIFIED, Uppsala. Uppsala: (VH) > Dept. of Animal Breeding and Genetics (until 231231) <https://stud.epsilon.slu.se/view/divisions/OID-670.html> urn:nbn:se:slu:epsilon-s-7299 eng |
| spellingShingle | Animal genetics and breeding Lindberg, Louise A genetic study of summer eczema in Icelandic horses |
| title | A genetic study of summer eczema in Icelandic horses |
| title_full | A genetic study of summer eczema in Icelandic horses |
| title_fullStr | A genetic study of summer eczema in Icelandic horses |
| title_full_unstemmed | A genetic study of summer eczema in Icelandic horses |
| title_short | A genetic study of summer eczema in Icelandic horses |
| title_sort | genetic study of summer eczema in icelandic horses |
| topic | Animal genetics and breeding |
| url | https://stud.epsilon.slu.se/11078/ https://stud.epsilon.slu.se/11078/ |