I hope those who enjoy racing and have protested that the majority of horse owners love and cherish their horses, read the link nightowl posted (thanks nightowl). The article states (amongst many other disturbing facts) that the numbers being bred for racing are far higher now than ever before and that,out of a possible life span of 30 years, the average racing horse lives 5 years.
This happens in a country that was up in arms about processed foods like beefburgers being "contaminated" with horse meat (though, of course, it is wrong for processed foods to contain ingredients that are not listed). To them, it just didn't feel right to eat a horse and there was a lot of superior sniffiness about those foreigners that did. And yet this article demonstrates that huge numbers of horses are destroyed in this country for export elsewhere. It makes no difference to the horse where it is eaten.
As with hunting, people try to justify their actions by saying that these animals wouldn't exist if they were not killed - that it is necessary to control numbers. I'm fairly sure - if there was a will, and large sums of money were not involved - it would not be an impossible exercise to control animal populations by other means.