Madonna is recovering at home after breaking several bones in a horse riding accident on her country estate on Tuesday.   The singer suffered a broken hand, a broken collar bone and three cracked ribs after falling from a horse she had never ridden before, in the grounds of her Ashcombe House estate on England's Wiltshire-Devon border.   Madonna - who has only been riding for a few months - was celebrating her 47th birthday with her husband and children when the incident happened. After being discharged from hospital in Salisbury late on Tuesday evening, she is now recuperating at home.   The accident is anticipated to delay her forthcoming dance album Confessions On A Dancefloor - which was due to be released in November. Her US spokeswoman Liz Rosenberg confirms, "She's walking and talking. I don't know if she's going to be hanging from a disco ball anytime soon."