A reg'd quarter horse mare I was looking into buying has "Impressive", 6 generations back and "conclusion" 5 generations back. She was tested for HYPP and turned up negative but I was wondering what would the likelyhood of her foals turning up positive be, if lets say, she was bred to a horse without the Impressive bloodlines??
Would there be an equal chance that they show up positive. Or a lesser chance because of her being neg, and how far it is down the lines from the source. ?