Originally Posted by Pedigree Ann

Rasmussen did not invent inbreeding to females, he just gave it a name. Using full or half-siblings for inbreeding has a very old pedigree <joke>. Boussac used it (check out Tourzima), the original Aga Khan used it (check out Gallant Man), US breeders of a half-century ago were putting together the full brothers Sir Gallahad III and Bull Dog with abandon. Go back to the 1800s - the damsire of Wise Counsellor, Russell (a SW and winner of 19 races), was by Eolus out a mare by Scathelock, these being half-brothers, both out of the mare Fanny Washington. If anything, old-time breeders inbred more closely than we consider acceptable today and that includes to females.

Take a look at George Pope's genetic masterpiece, his homebred Hillary, for an extreme example of inbreeding to superior females.