Ban on Slaughter Raises Number of Abandoned Horses

The number of horses being abandoned is said to have risen since the ban on horse slaughter. There aren't enough homes to house all of these horses. There aren't enough resources for rescues to care for all these abandoned horses.

Dogs and cats can be humanely euthanized. Yes, it is sad but I don't see that changing anytime soon. Isn't there an affordable way to do this with horses as well so those that are too sick or have bad temperaments (just like with dogs and cats) can be humanely laid to rest? Abandoned horses are without medical care and left to fend for themselves resulting in malnutrition.

What's the answer?