Breeding Incentives Cause Spike in Slaughter Stats

An old study; but once the incentives were removed, slaughter rates dropped
by more than half!

All indications are that racing is a major contributor to the horsemeat
export trade. An amazing statistic from the U.S. is that the removal of
tax benefits which encouraged the breeding of racehorses saw the total
number of horses slaughtered drop from 300,000 in 1990 to 88,000 in
2005.[6] That's a whopping 70% reduction despite an influx of Premarin
mares since 2002, though an offset has been an increase in rescue
organizations.

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Source; http://www.users.bigpond.com/berrime/slaughter.htm