As you can tell hybrid vigor is a hot topic at this point in the year for Speedlines. The reason for this look at the Thoroughbred as an outcross is a topic that needs to be looked at and discussed. We see a significant number of common ancestors in our pedigrees today and we need to be on the lookout for the right outcross to enhance our opportunity to improve the racing American Quarter Horse.
But first the starting point in developing a breed is a combination of using the breeding systems inbreeding and/or linebreeding, outcrossing or crossbreeding to produce families within the breed. Then these families or bloodlines can be crossed with each other to produce hybrid vigor that produces foals that are better than the parents. No matter how you look at it the key to improvement is through the genetic diversity that comes through the genetic differences in the bloodlines being crossed. That is the key to success with hybrid vigor.
This takes us to the adage of “breed the best to the best” and we do that by breeding one fast horse to another or we breed our mare to a fast stallion that would improve her speed. We see the first case of this in Colonial America. The horse considered the first major foundation sire of the American Quarter Horse was Janus, a grandson of the Godolphin Arabian, one of the three foundation sires for the Thoroughbred. Janus was imported from England in 1759 when the racing was done on short strips of open land that called for a horse with speed. This is how the name Celebrated American Quarter Running Horse was born. Janus died in 1780 serving as a popular sire for a long time because he was the best at producing that speed.
The blood of Janus formed a number of early foundation families such as the Peacock family founded by Old Peacock by Janus and out of a Spanish Mare; the Babram Family founded by Old Babram by Janus and out of a Janus Mare; the Bacchus Family was founded by Old Baccus by Old Babram and out of a Janus mare; the Celer family was founded by Old Celer by Janus and out of Brandon by Aristotle; and the Twigg Family was founded by Old Twigg by Janus and out of Puckett’s Switch by Janus and she was out of a double bred Janus mare. The Printer Family shows as much Janus blood as any stallion we have seen. He was by Atkinson’s Janus by Janus and out of a Janus mare. The second, third and fourth dams in the pedigree of Atkinson’s Janus were Janus bred mares. Old Printer’s first and second dams were by Janus. Helen Michaelis, who researched and did the pedigrees on these horses, believed that the breeders of this time felt that if a little Janus blood was good then a lot was better. This inbreeding practice may be a key as to how the American Quarter Horse survived to become…