We lost around 195 Horses in Training (UK and Ireland) in 2010 as a result of fatalities in action, on the gallops, or to illness or other accidents. That's not the full amount, because some will have been injured on-course and been put down later, so their passing won't be reported by the racing Press.
I think it's good we tribute the animals which are, after all, the reason for this and so many other forums, the providers of thousands of jobs and billions of any currency in betting, but it's also important to be able to counter the hostile attacks on racing by certain organisations which see it on a par with bull-fighting and other activities involving the deliberate death of animals. Behind the scenes, vast amounts of research (often funded, in fact, by the Levy) goes into racehorse welfare and health issues, such as stem cell research, ulcers, stress disorders, nutrition, to name but a few. We do not 'slaughter hundreds' of horses every year to make a Roman holiday. We have many faults, one of which that still worries me being overproduction of foals, but we are not butchers. I hope our little tally, while respecting and often mourning the loss of some of the more outstanding stars, helps to put some of the accusations levelled at us into a better perspective.
There are around 18,000 racehorses in training in the UK and Ireland right now, so that is thousands and thousands of runs (on the Flat and in NH) all through the year. From the records we ourselves monitor, the percentage of fatality is probably about right for any demographic, expressed in dispassionate terms. Whether the horse is well known to us, or a debuting youngster, their loss is (or should be) always regretted, but it is not on the epic and brutal scale so often claimed by the enemies of racing.
And, for what it's worth, I just found my stats for 2006's fatalities: 223 known; 2008 - 211 known. Perhaps we are getting a little safer, after all?