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The Influence of Great Sires on Their Breeds

University of Kentucky

Abstract

There is no problem confronting the constructive breeder which, perhaps, is of greater importance than the method, or methods, for breed improvement. When the breeds were young, breeders had a very great variety of qualities from which to select in their efforts to establish and improve the breed. As time went on the selected qualities approached pure lines and selection had less and less effect upon the breed.

One who has made a study of the founding of the breeds can not fail to be impressed with the very rapid progress made in the early years of their establishment as contrasted with the slow progress later on. It is not unusual to hear the modern breeder criticised because he can not in an equal length of time show as much progress as was made by one of the pioneers in founding the breed.

It is easy to explain the success of the one and the apparent failure of the other.