Colour inheritance in sheep III. Face and leg colour
A type of pigmentation in sheep is found in which the derivatives of the primitive outer coat-face and leg hair, kemp, and birth-coat-are coloured and the body of the fleece practically free from colour.
Variations in face colour fall into three groups:
Those affecting the relative proportions and distributions of coloured, and white fibres.
Those affecting the dilution of this pigment.
Those affecting the precise degree of restriction of pigmentation in the white-faced sheep; this pigment being mainly confined to the skin.
A further analysis of the results of T. B. Wood in his crosses of Suffolk and Dorset Horn sheep shows that these results can be explained on the basis of a two-factor difference, the variations in this case being of group 1.
As a working hypothesis, it is suggested that the above classification, together with the recognition that variations of group 1 are mainly due to the different states of two factors, affords a reasonable explanation of the variations in face colour found in the white-fleeced breeds of sheep and in their crosses.
Volume 100, 2021
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