Summary

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

At the present day Aberdeen-Angus cattle are hornless, similar in weight to Shorthorns and Herefords, and black, with occasional white markings upon the back underline. In the stock-breeder's sense of the term the Aberdeen-Angus breed is pure; but the irregular occurrence of white on the underline suggests that from a more stringent point of view the purity is not absolute. For that matter, it is inconceivable that any set of animals of more than one cell—or even of one cell, perhaps—can ever be absolutely pure.
Source: Wikisource

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

There being no deception about the colours, it is easy to see how the whity-grey or light dun vanished long ago, and the dun lingered on a while longer, while the hornless masqueraders, a gradually decreasing number, kept the horns bobbing up till comparatively recent times.
The blackish-brown cattle, the "foundlings" as we have called them, the date of whose arrival upon the scene we have been unable to fix, produced brindles with both races—dark brindles with the black natives and light brindles with the Scandinavians.
Source: Wikisource

Get perspective with Kwize: daily news enlightened by great literature