[QUOTE=Chrome Prince]

Why then can jumps horses carry 10kg more than flat horses and still win and not even be puffing?

QUOTE]

And not even be puffing? You must be kidding. Yes they are carrying 10kg more than flat horses, but they are racing against other jumps horses not flat horses so the comparison is irrelevant.

Obviously the performance of a horse will decrease with the more weight it carries. It is just crazy to suggest otherwise.

Try driving a car 1000 kilometres by yourself. Then drive back, but fill your car with people and fill the boot. I guarantee that you will lose a lot more fuel, hence decreasing your performance. If this is the case for a car, with 100 horse power? surely similar results can be expected from animals.