Íslenskar landbúnaðarrannsóknir - 01.03.1970, Síða 105

COLOUR INHERITANCE IN ICELANDIC SHEEP 103
Parents: Progeny:
Mouflon ram x Rambouillet ewe —> White ram (Fig. 1B)
a) W1W1W2W2 W1W1W2W2 WiWiW2w2
b) A4A4 A1A1 A1A4
White Fi-ram x Mouflon ewe —> Ram 603-S10 1)
(Fig. 1B) (Fig. 1A) (Fig. 2B)
a) W1W1W2W2 W1W1W2W2 W1W1W0W2
b) A1A4 A4A4 A1A4
Ram 603-S10 x rec. black ewe —> White lamb 2)
(Fig. 3A)
a) W1W1W2W2 W1W1W2W2 WiWiW2w2
b) A1A4 A5A5 A1A5
White Fi-ram x White het. Ramb. ewe —> Black lamb 3)
(Fig. 1B) (Fig. 4A)
a) W1W1W0W2 W1W1W 2W2 wiwiW2w2
b) A1A4 A1A5 A4A5
Ram 603-S10 x White het. Ram. ewe —> Black agouti lamb 4)
(Fig. 4B)
a) W1W1W2W2 Wi?W2? ?
b) A1A4 A1A3 A3A4
a) Genotype according to Warwick et. al.
b) Alternative interpretation.
1) The colour o£ the ram is described as brownish which indicates strongly that he was white
with tan colour present. This seems very likely from figures 1B and 2B.
2) This white lamb seems to have a tan spot on the neck, which would agree with the pres-
ence of tan colour in its sire.
3) This lamb shows the mouflon pattern clearly as well as white markings.
4) This lamb shows almost certainly the black badgerface-mouflon colour pattern with a white
head spot. The A3-allele has been found in the Rambouillet (Heller, 1915).
Hoogshagen (1967) that the gene for do-
minant black is not allelic to the gene for
white. It is not clear whether dominant
black sheep usually carry the gene for
wliite. Vasin (1928) assumes that they do
so, while Adametz (1917) and Bonikowsky
(1935) have not found the gene for white
to be present in the Karakul in their ex-
periments. The two latter authors on the
other hand have reported several cases of
dominant brown which they find to be
hypostatic to dominant black.
Zóphóníasson (1934) reported the occurr-
ence of dominant black in the Icelandic
sheep. It has not been found in the present
study.
C. DOMINANT BROWN
1. Darkbrown
The dominant brown colour shows great
variation according to Vasin (1928) and
Bonikowsky (1935).
Duck (1921, 1922), reporting on colours