Editing Breed registry (section)

==Closed stud book==
A closed stud book is a stud book or breed registry that does not accept any outside blood. The registered animals and all subsequent offspring trace back to the [[foundation bloodstock|foundation stock]]. This ensures that the animal is a [[purebred]] member of the breed. In horses, an example of a closed stud book is that of the [[Thoroughbred]], with a stud book tracing to 1791.<ref>{{cite web |url=http://www.kyhorsepark.com/imh/bw/tbred.html |archive-url=https://web.archive.org/web/20031221134420/http://www.kyhorsepark.com/imh/bw/tbred.html |url-status=dead |archive-date=2003-12-21 |title=Kentucky Horse Park |publisher=Kyhorsepark.com |access-date=2013-06-10 }}</ref> The [[American Kennel Club]] is an example of a [[kennel club]] with primarily closed books for [[dog]]s; it allows new breeds to develop under its Foundation Stock Service (FSS), but such dogs are not eligible for competition in AKC [[conformation show]]s, although they do compete at those shows in the FSS category. For the breed to move to the Miscellaneous class and then to fully recognized status, the breed's stud book must be closed.

A closed stud book allows the breed to stay very pure to its type, but limits its ability to be improved. For instance, in performance disciplines, an animal that is successful in competitions is generally worth more than one that is pure. It also limits the [[gene pool]], which may make certain undesirable characteristics become accentuated in the breed, such as a poor conformational fault or a disease. 
<!--be good to find some stuff on the performance and health of the Thoroughbred and the arguments for and against opening up the registry.  Might also be useful to discuss genetic diseases, HYPP, HERDA, etc. (something like 25% of all cutting horses carry HERDA-->

Some closed stud books, particularly for certain European breeds such as the [[Finnhorse]] and the [[Trakehner]], may also have a set of studbook selection criteria where animals must meet either a conformation standard, a performance standard, or both.<ref>[http://www.hippos.fi/files/15505/Jalostusarvostelu_ja_palkitseminen200616.pdf Finnhorse's registration, studbook registration, awarding and use to breeding] {{Webarchive|url=https://web.archive.org/web/20161017002729/http://www.hippos.fi/files/15505/Jalostusarvostelu_ja_palkitseminen200616.pdf |date=17 October 2016 }}(in Finnish)</ref><ref>[http://www.hippos.fi/files/14056/Rakenne_ja_terveysvaatimukset151215.pdf Finnhorse's conformation and health requirements] {{Webarchive|url=https://web.archive.org/web/20201027013255/http://www.hippos.fi/files/14056/Rakenne_ja_terveysvaatimukset151215.pdf |date=27 October 2020 }}(in Finnish)</ref>

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