Íslenskar landbúnaðarrannsóknir - 01.09.1975, Síða 58

Íslenskar landbúnaðarrannsóknir - 01.09.1975, Síða 58
56 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR gested by Adalsteinsson (1970) that the tan colour in the Icelandic sheep is the same colour as dominant brown in the Karakul and related breeds. In the following, the main results ob- tained through measurements and scoring of wool quality characteristics with particular reference to the occurrence and inheritance of tan colour will be given. Some results from investigations on the relation between tan colour and other characteristics will be reported on. Preliminary results from some of the investigations described here have been published earlier in Icelandic in farming periodicals. MATERIAL AND METHODS Wool samples were collected from 140 Ice- landic sheep in 1953 for measuring staple length and for microscopic measurements of fibre diameter and recording of medullation and occurence of tan coloured fibres. The measurements were carried out at the Wool Laboratory of the Agricultural College of Norway and were based on 3 samples with 100 fibres measured from each animal Adal- steinsson, 1956). Wool samples were collected from 204 adult rams exhibited at ram exhibition in Iceland in the autumn of 1957 and 1959- Measurments of staple length and fibre dia- meter of those samples were made at the Department of Agriculture of the University Research Institute in Iceland (Adalsteins- son, 1958 and 1961). In the above investi- gations, tan fibres were also recorded and their diameter measured. In 1954 scoring for occurrence of tan colour on newborn lams was initiated at the Experimental Farm Hestur in Iceland (Páls- SON, personal communication). The scores used were as follows (Adalsteinsson, 1963, 1970): Score Amount of tan colour 1 White, no tan colour visible. 2 Tan colour on head, feet or tail. 3 Tan colour on head, feet or tail, and some tan colour on body, but body more white than tan. 4 Tan colour on head, feet, tail and body and body more tan than white. 5 Tan colour on head, feet and tail and body completely tan. Classification of individual fleeces after shearing, based on occurrence of tan fibres, was initiated for experimental purposes at the Experimental Farm Hestur and at the Agricultural School Hólar in 1961. The classes were as follows (Adalsteinsson, 1962): Class Amount of tan colour A No tan fibres visible. B Tan fibres visible in the wool from the lower parts of the Iegs, but the main part of the fleece free from tan fibres. C Tan fibres visible in most parts of the fleece. Classification of pelts of live lambs at weaning at 4—5 months of age, based mainly on amount of tan fibres present was initiated for experimental purposes at Hestur and Hólar in 1961. The classes were as follows (Adalsteinsson, 1962, 1963): Class Amount of tan colour A White pelts, without tan fibres, outer coat even, curly and lustrous. B White pelts, without tan fibres, outer coat of löwer quality than in A. C Tan colour on outskirts of pelt, but no tan fibres in the main part of the pelt. D Tan fibres clearly visible in the pelt.

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