Originally Posted by ScoutRacer
Produce a philly/colt that is not desired by that I mean less or much less than the two of them are. I know a lot goes into horse breeding so please spare me the intricate details.
It can happen. Just because both parents are well bred or even nicely conformed it could be that as a pair they don't nitch. Some breeding lines in spite of being good lines just don't work well. This has been proved in TBs and WB.
Since I know WBs fairly well there are hanovarian lines that are almost always mated in the background over and over simply because they consistantly produce a superior foal while other lines are almost never seen together.