▁Most ▁of ▁the ▁war mb lo od ▁bre eds ▁used ▁in ▁sport ▁horse ▁discipl ines ▁have ▁open ▁stud ▁books ▁to ▁varying ▁degrees . ▁While ▁pedig ree ▁is ▁considered , ▁outside ▁blood lines ▁are ▁admitted ▁to ▁the ▁registry ▁if ▁the ▁horses ▁meet ▁the ▁set ▁standard ▁for ▁the ▁registry . ▁ ▁These ▁reg ist ries ▁usually ▁require ▁a ▁stud book ▁selection ▁process ▁involving ▁jud ging ▁of ▁an ▁individual ▁animal ' s ▁quality , ▁performance , ▁and ▁con formation ▁before ▁registration ▁is ▁final ized . ▁A ▁few ▁" reg ist ries ," ▁particularly ▁some ▁color ▁bre ed ▁reg ist ries , ▁are ▁very ▁open ▁and ▁will ▁allow ▁membership ▁of ▁all ▁horses ▁that ▁meet ▁limited ▁criteria , ▁such ▁as ▁coat ▁color ▁and ▁species , ▁regardless ▁of ▁pedig ree ▁or ▁con formation . ▁ ▁Bre ed ▁reg ist ries ▁also ▁differ ▁as ▁to ▁their ▁accept ance ▁or ▁re jection ▁of ▁bre eding ▁technology . ▁For ▁example , ▁all ▁J ockey ▁Club ▁Thor ough bre d ▁reg ist ries ▁require ▁that ▁a ▁registered ▁Thor ough bre d ▁be ▁a ▁product ▁of ▁a ▁natural ▁m ating , ▁so - called ▁" live ▁cover ". ▁A ▁fo al ▁born ▁of ▁two ▁Thor ough bre d ▁parents , ▁but ▁by ▁means ▁of ▁artificial ▁ins em ination ▁or ▁emb ry o ▁transfer , ▁cannot ▁be ▁registered ▁in ▁the ▁Thor ough bre d ▁stud book . ▁However , ▁since ▁the ▁advent ▁of ▁DNA ▁testing ▁to ▁verify ▁parent age , ▁most ▁bre ed ▁reg ist ries ▁now ▁allow ▁artificial ▁ins em ination , ▁emb ry