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HMM interesting statement.... as a breeder TH an PHA status has everything to do with being good!
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Well, I'll open the can of worms...
When a breeder is breeding for calves (such as this heifer) with a main goal being to get him/her in a backdrop photo, for show ring purposes....TH and PHA is very low on the list of priorities. This heifer will make the owners a very good show prospect, and probably a hell of a cow later on. The fact that she could be a carrier will not matter one bit when it comes to how she does on the show road, and in all reality it should not stack up to a hill of beans as far as her life as a cow either. If you have a carrier, breed her to a non carrier, it's really just that simple. Smart managment is the key. No one is telling anyone to go out and buy "dirty" genetics and breed them to carriers. If a female is truly a good one (and this one is) then her TH status is very easily controlled by smart managment. NO, you are not going to eradicate the defect this way, but why would you want to eliminate some of the better genetics from a breed because of a defect? I am sure that when these folks bred that cow to Double Vision, the goal was to get a calf that would perform well on the show road, DV does that. They'll get her tested, and breed her accordingly. TH and PHA status really does not have "everything" to do with one being good. If you do not want to "risk" buying a carrier, then don't do it. It can be controlled, just use your head when breeding.