 Combined over a period of 22 years, the top 174 Northern Dancer offspring at the Keeneland Sales sold for a total $160 million.The bidding duels between John Magnier and Robert Sangster of Coolmore Stud and Sheikh Mohammed bin Rashid Al Maktoum of Darley Stud helped drive up the prices as both sought future breeding prospects.Three of the most expensive colts ever sold at public auction were sired by Northern Dancer