I don’t know a lot about genetics or pedigrees, but when I went horse-shopping a little less than a year ago for a low level event horse prospect, I ended up looking at a lot of OTTB pedigrees, and becoming familiar with some names and lines that people liked or didn’t like as far as sport horse ability, soundness and temperament. I still don’t know much about pedigrees but I feel like I learned a lot about how people view them.
People seem more interested in the temperament of the stallion line rather than the mare line. After spending WAY too much time on the internet, I got a little unnerved that the horse I was seriously considering (and ended up buying) had a pedigree that had a lot of stallions with a reputation for being nasty. I ended up just picking the horse I really liked and not worrying that he might be a psychopath because of his breeding (and sure enough he’s very sweet, if a handful at times).
I always thought that in reproduction, it is a toss up, with the issue being dominant or recessive genes, rather than male or female side. Is temperament more likely to be inherited from the stallion? Are there any characteristics that are more likely to come from the male line?