Preparations to sedate as many as 300 horses stabled at Belgrade's racecourse to keep them calm during a Rolling Stones concert have enraged Serb animal lovers who are lobbying to have the gig moved to another venue. The concert is expected to draw more than 100,000 people to the Hippodrome, Belgrade's largest fenced space. The horses will be only a few meters from the stage. "Horses differ, the same as people. Some are more nervous, more skittish," said hostler Jovanka Prelic. "If they get too nervous or start to panic during the concert, they'll get sedatives." The sedative would be diazepam. In Serbia it trades under the name Bensedin, a very popular drug during the 78 days of NATO air strikes in 1999, when much of Belgrade's adult population was on tranquilizers.