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Estonian Ruhnu sheep ((エストニア語:eesti maalammas)) are a breed of native domesticated sheep found on the small Estonian island of Ruhnu in the Gulf of Riga in the Baltic Sea.〔(North Shed: ''Origin and diversity of North European sheep breeds.'' )〕 The Estonian Ruhnu sheep population is thought to descend from sheep left on Ruhnu by Swedish-speaking inhabitants who settled on the island in the 14th century.〔Tapio, I. et al. (2005). ( Unfolding of population structure in Baltic sheep breeds using microsatellite analysis ). ''Heredity'' 94, 448-454〕 In 1944 a population of 300 sheep was documented. The current population of the breed is around 30 animals. It is thought that Estonian Ruhnu sheep were originally raised for producing meat and wool.〔Grigaliūnaitė, Ilma et al. (2003) (Microsatellite Variation in the Baltic sheep breeds ). ''Veterinaria ir zootechnika'' 21, 66-73.〕 Physical adaptations of the Estonian Ruhnu sheep population to seaside pastures and small paddocks suggests that these sheep have had a rather long period to adapt to their environment. Most of the small population of Ruhnu sheep are white or cream colored with greyish head and legs and some have a distinctive "badgerface" pattern. The ewes are polled and approximately 10% of rams are horned. 〔 The sheep have short or medium length tails. Distinctive from many other breeds of sheep, some Estonian Ruhnu sheep have one or two beads under the jaw. The wool is double coated and of two fibre types and it is generally used for making hand knitting yarn and clothing, such as sweaters. Adult live weight of rams is maximum 80 kg (175 lb) and of the ewes 50 kg (110 lb).〔 Although there is considerable genetic variation in most of the northern European sheep breeds, Ruhnu sheep, as well as Roslag sheep and Dala Fur sheep (both originating in Sweden) exhibit the highest within-population inbreeding.〔Tapio, Miika (2006). (Origin and maintenance of genetic diversity in northern European sheep ). ''Acta Universitatis Ouluensis, Series A: Scientiae Rerum Naturalium'' 473, 44.〕〔Tapio, Miika et al. (2005). (Native breeds demonstrate high contributions to the molecular variation in northern European sheep ). Molecular Ecology 14 (13), 3951–3963.〕 While the Ruhnu breed was found to be less variable than other Baltic sheep breeds, indicating the need for a breed management plan to prevent further loss of genetic variation, the population size of around 30 sheep is listed as stable. All remaining Estonian Ruhnu sheep on the island live in one semimanaged existing flock, with several individual sheep living on the Estonian island of Kihnu.〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Estonian Ruhnu sheep」の詳細全文を読む スポンサード リンク
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