Fróðskaparrit - 01.01.1993, Qupperneq 99

Fróðskaparrit - 01.01.1993, Qupperneq 99
Narthecium ossifragum-associated photo- sensitization in sheep in the Faroe Islands 103 Arne Fláøyen, Jóhannes Jóhansen and Jústines Olsen Úrtak Ljósviðkvæmi, sum veldur álvarsligar sjúkubroytingar í skinninum á seyði, ið etur kattarklógv, Narthecium ossifragum, er vanligt í Føroyum. Tað er serliga ein sjúka hjá lombum, og flestu tilburðimir em seinna partin í juni, í juli og fyrra partin í august. Nakrir fáir tilburðir hjá eldri seyði em seinnu helvt í apríl og fyrru helvt í mai, tá ið N. ossifragum sprettir. Samanlagt vera umleið 20 tilburðir stadfestir um árið, og sjúkan hevur lítlan týdning fyri føroyska seyðahaldið. Sjúkan er víða um, men ger mest um seg í ávísum økjum í Eysturoy og Streymoy. Abstract Photosensitization, causing serious skin defects, in sheep grazing Narthecium ossifragum occurs regularily in the Faroe Islands. It is a typical disease of lambs and most cases are seen in late June, July and early August. A few cases in adult sheep occur in late April and early May, when the N. ossifragum is sprouting. In total about 20 cases are diagnosed every year and the problem is of minor importance for the Faroese sheep industry. The disease is wide spread but is must prevelant in certain areas on Eysturoy and on Streymoy. Introduction Photosensitization in sheep is an important problem in various parts of the world. Most photosensitization diseases are associated with ingestion of plant or fungal toxins. In The Faroe Islands photosensitization oc- curs regularly, but the problem seems to be of minor economical importance (Fig. I.). In some places in the Faroes the disease is known as ormasjúka (literally: worm dis- ease) or lambið harðnar upp í skorti (Eng: desiccation of the skin of the face of the lamb). The disease is also well known to occur in lambs in westem Norway (Fláøyen, 1993) where the disease is called alveld (literally: elf-fire). Several thousand cases are known to occur in Norway every year. In the northem regions of the British Isles, the same disease is called plochteach, saut or yellowses (Ford, 1964). Aetiology (cause of the disease) The disease occurs only in sheep grazing the lily Narthecium ossifragum (Fæ: Kat- tarklógv; Fig. 2). N. ossifragum is a loosely to densely clonal, perennial herb, 5-30(-40) cm tall with a creeping rhizome. The plant occurs on oligotrophic, mesotrophic and eutrophic peat deposits in Scandinavia to Fróðskaparrit 41. bók. 1994(1993): 103-106
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