Thoroughbred Sirelines: general overview

Author: Jana Nemeckova, published: 7th October 2017

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We all know that from various Arabian or Barb stallions, who were brought to England in the 17th and 18th century and who were the foundation sires of the modern horse breed called thoroughbred, only three were able to establish their own sireline which continues up to today. But now it's three hundred years later, and more than 20 thoroughbred generations have passed. It's not always easy to recall who's who - not even the grandsire, all the more so the whole sireline.

So we created the BASIC scheme and both historical and modern branching of all three lines, including many of the fundamental stallions, just to have a clear starting point to understanding thoroughbred sirelines. It's neither complete, nor much informative; it's really supposed to be only "a skeleton" of thoroughbred breeding, easy to use and to understand for everybody.

We added a sireline of the damsire for each stallion, which is another feature worth studying. These lines are composed only of hint names, whose complete scheme follows at the end of the article, and is certainly worth looking at also as simplified and easily comprehendible scheme of branching of the whole sirelines.

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Simplified schemes of sirelines

Black names are used as hints in damsires' lines in the previous scheme. Grey names are important branching points, or hints for better recalling of the particular line. Hint names were chosen not only with respect to their importance, but also with intention to make the structure as easy to comprehend as possible. That's why Himyar was chosen instead of three lines of Peter Pan, Colin, or Ultimus, or why Nearco covers the most of his own sireline, except for the giant branches of Nasrullah and Northern Dancer. At this point, major branching was the key feature instead of detailed modern lines, which would create only incomprehensible mess. Blue names in the following scheme at least indicate which important sires or branches fall under particular hint names, and more details can be obtained either in big schemes above, or by exploring pedigrees of particular sires.