Originally Posted by bubba13
This is wrong. HYPP "carriers" (N/H) horses can be and frequently are symptomatic. It's not like HERDA.
So yes, breeding an N/H horse to an N/N (non-Impressive) horse will result in an afflicted HYPP N/H offspring 50% of the time.
Sorry Bubba - just wanted to clarify (understanding that you were spelling it out as simply as possible). The non-Impressive in the parenthesis does not stand for the N/N, Bubba is just saying that a horse that contains no Impressive blood would obviously not have any HYPP genes. A horse that is listed as N/N DOES have Impressive blood but is NOT a carrier of the gene.
Only an N/N horse or a horse that does not have any Impressive blood would not have a chance of passing on the gene.