Traditional linebreeding guidelines are not static. In his latest book Jack Glengarry explains that the principles are developmental, on going and ever changing. There is strong evidence that the females in the breed exercise a great influence in improving thoroughbred racing stock.

Earlier in Upgrading Thoroughbred Families Jack Glengarry outlined the selective breeding principles, which originated from the great Italian horseman Frederico Tesio. They are now seen in a new and broader perspective and explained in Jack Glengarry's easy, chatty style. Get your matings right on paper and then check the parents for compatibility in type and temperament, he recommends.

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