Íslenskar landbúnaðarrannsóknir - 01.03.1970, Qupperneq 99

Íslenskar landbúnaðarrannsóknir - 01.03.1970, Qupperneq 99
COLOUR INHERITANCE IN ICELANDIC SHEEP 97 TABLE 57 Segregation at the S-locus from matings with genotypes of both parents known Mating White markings of progeny Males Females Both sexes Sire Dam Abs. Pres. Total Abs. Pres. Total Abs. Pres. Total S1S2 X SiS2 3 0 3 5 0 5 8 0 8 SiS2 X S2S0 1 1 2 1 4 5 2 5 7 S2S2 X S1S2 27 29 56 29 24 53 56 . 53 109 S‘jSo X S2S2 0 88 88 1* 85 86 1* 173 174 Sum .... 31 118 149 36 113 149 67 231 298 *) Unexpected result rings, to code number 80, white liead spot only and code number 90, white socks only. It should be pointed out that the 19 lambs with no code number in the bottom of table 58 had usually been described as pie- bald (Icel.: flekkótt), without any further definition. Three types of white markings are of considerable interest, as tliey have been assumed to be inherited in a different way from that found here. The first of these is the hood (Persian liooded) which has been assumed to be dominant and to give hood- ed when liomozygous and piebald when heterozygous, the second is the blaze which has been assumed to be inherited as a multifactorial character, and tlie third is tlie white collar, which lias been reported to be a dominant character (for references see Berge, 1964 a). The exact description of the white mark- ings of the parents in the material was limited, and as the number of parents with- in any one class of white markings was also very limited, a classification according to code number of parents does not throw much light on the exact nature of the in- heritance of special types of white mark- ings. One can, liowever, draw certain con- clusions about the three types of wliite markings mentioned above from the pre- sent data. There were thus two rarns with code number 44 used to a considerabe extent, and several of the ewes they were mated to were without white markings, either known heterozygotes or with one un- known allele at this locus. Code number 44 refers to a hood with some dark patches and also a head spot or nose spot or both, a type of markings which closely resembles that found in hooded sheep of Asiatic origin. The two rams mentioned above should have given only piebald progeny when mated to nonwliite ewes with white markings, if the hood was dominant, but instead they gave progeny with white mark- ings only in those cases when the ewes could be assumed to carry the S2-allele, and they therefore gave altogether several pro- geny without white markings. Tliis condi- tion rnust therefore be regarded as reces- sive in the Icelandic sheep. With regard to the blaze markings which have been assumed to have a mutifactorial
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