By Alan Baldwin WINDSOR, England (Reuters) – Horse racing is the “Sport of Kings”, and it was also the passion of Queen Elizabeth whose love of all things equine became a feature of her 70-year reign. The late monarch’s horses won more than 1,800 races and her annual presence at Royal Ascot and the Epsom Derby reflected a deep personal interest as much as carrying out royal duty. An enthusiastic owner and breeder, with the Royal Stud at her Sandringham estate, she had a deep knowledge of the sport and seemed happiest when the discussion turned to horses. An official photograph released by the …