Summary

James Wilson The evolution of British cattle and the fashioning of breeds…

It is true that many cattle now hornless—and sheep, too, for that matter—are descended from ancestors that were horned; but in those cases the horns were removed by crossing with hornless breeds.
Whence, then, came our hornless cattle? That question can only be answered after some consideration of their history and distribution. At the present time there are only three breeds of hornless cattle in Britain; but in the eighteenth century there were hornless breeds in eight or ten places round the coasts of England and Scotland and also in Ireland.
Source: Wikisource

James Wilson The evolution of British cattle and the fashioning of breeds…

There are more brindled cattle than in Aberdeen; some are dark red, and others of a silver yellow or dun. A few are black with white hairs intermixed; and occasionally a beast is seen that is altogether white, with the exception of a few black hairs about the head." [21] Youatt makes no kind of reference to the Aberdeenshire polled cattle, but of the horned ones he writes, "The colour is usually black, but sometimes brindled." [22] Macdonald and Sinclair tell us that "Formerly, both in Angus and Aberdeen, the breed [23] embraced a variety of colours as well as difference in size.
Source: Wikisource

James Wilson The evolution of British cattle and the fashioning of breeds…

They are believed to have originated in reversions or sports according as hornlessness or hornedness is held to have been the older condition. Darwin favoured the latter view: "It is probable that some breeds, such as the semi-monstrous niata cattle, and some peculiarities such as being hornless, etc., have appeared suddenly from what we may call a spontaneous variation," [1] and "No one can give any explanation—although no doubt there must be a cause—of the loss of horns, any more than of the loss of hair, both losses strongly tending to be inherited.
Source: Wikisource

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