Dear Trilochan,
As per my understanding, since you mentioned the person as "Horse Owner", the amount receivd must be against the supply of horse for particiating/performing in the horse races. So, lets not call this as "Winning from horse races". To me the service sounds like "Supply of horse" to participate in the horse races.
With the introduction of "Negative List" all sorts of services have been made taxable, so in my opinion the service in question will also be a taxable service since turnover exceeds Rs.10 lacs in a year.