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Thoroughbred breeding theories
Thoroughbred horse breeding theories are used by horse breeders in an attempt to predict successful mating of racehorses to produce progeny successful in horse racing. They stem from the belief that careful analysis of bloodlines, particularly the female line, can lend predictability to the breeding process. The best-known classification system was developed in the last 1800s by an Australian named Bruce Lowe, who analyzed the statistics of major race winners and ranked the distaff or mare lines by their degree of success. This and similar ranking systems are still used by some breeders today, though a prestigious pedigree does not necessarily translate into racing success.
==The female line==
Thoroughbred horses are traced through the distaff line, also called the mare line or tail-female line. This maternal line known as a "family". This practice dates to the beginning of the General Stud Book (GSB). This was done because the mares produce far fewer foals than stallions.
However, modern genetic studies have revealed that there are some cases where the haplotype in the mtDNA of modern Thoroughbreds differs from the stated dam line, suggesting that some records contain errors.〔 which cites 〕
Many horses were inbred in the early years of Thoroughbred development, which increased the chances of early horses appearing in many pedigrees today.〔(【引用サイトリンク】title= Inbreeding )〕〔(【引用サイトリンク】title= Equine Business Marketing )〕 One example was Old Bald Peg placed in family 6, one of the earliest tap-root dams, having been foaled around 1635. Most, if not all modern Thoroughbreds trace their ancestry to her through one or both sides of their pedigree.〔(【引用サイトリンク】title= Look here for racing's roots )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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