BLOOD­LINE PREF­ER­ENCE

CHANGE IN SE­LEC­TIVE CON­DI­TIONS LEADS TO CHANGE IN

EQUUS - - Conformati­on Insights -

Data in th­ese charts comes from the Trinity Col­lege ge­netic study led by E. P. Cun­ning­ham (“Mi­crosatel­lite di­ver­sity, pedi­gree re­lat­ed­ness and the con­tri­bu­tions of founder lin­eages to Thor­ough­bred horses,” An­i­mal Ge­net­ics, De­cem­ber 2001). When change in se­lec­tive con­di­tions is over­laid (gray and yel­low zones), the rea­son for the switch in pop­u­lar­ity of Eclipse- vs. Matchem- and Herod-line sires be­comes clear. Note the 30- to 50-year lag time. Fash­ions for mares are much less clear-cut than those for stal­lions, and even the most popular dam (Tre­gonwell’s Nat­u­ral Barb mare) holds a fre­quency of only 16 per­cent. This in­di­cates that al­lelic vari­a­tion is high­est in mare lines, per­haps be­cause breed­ers have con­tin­ued to try to “out­cross” by us­ing a wide va­ri­ety of mares.

ECLIPSE HEROD MATCHEM

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