Because genuine breeders can prove that their horse is registered. Also, the passport shows that all their vaccinations are up to date, which should stop certain diseases being spread!
Ahhh I see! But at the same time, the passports seem a bit far fetched at a fine of £5,000 if the horse has a passport, then is sold, the new owner can always apply for another passport and put whatever they like on it?? Hmm.
But that would not add value to a horse with known breeding, or help if the horse has vacs up to date. The only reason for "loosing the passport" so you could apply for a new one is if you want to hide something. I don't really think that it is worth the effort.
Hmm. I can see both points but it just seems like there are a few loopholes people can slip through to change a passport especially if they buy a horse and e.g. has an accident, cannot be ridden, they want to sell it for meat, they could apply for a new passport and then sell for meat after the vet has treated it for the accident? if that makes any sense at all.