"She names all her own horses, I believe -- it gives her fantastic pleasure, planning the whole process," Attenborough said.
It is a formidable operation with Royal studs at Sandringham and Wolferton in Norfolk and Polhampton in Berkshire, feeding into her training operation with about 25 horses racing each season.
One of the stallions at Sandringham is former Derby winner Motivator, with the queen part of a syndicate using the horse for breeding.
She will doubtless be hoping that one of his offspring can deliver her success at Epsom after the heartbreak of Carlton House's unlucky near miss two years ago.
The last Royal winner of the Derby, Minoru back in 1909, was owned by King Edward VII, who was renowned for his love of racing and the good things in life.
Edward also had success as the Prince of Wales with Diamond Jubilee in 1900, named in honor of his mother Queen Victoria's long reign.
For the current British head of state it would represent a monumental achievement to emulate this feat, but it is not for lack of knowledge or trying.
"She is a very well-informed and keen owner, probably the best-informed owner in the country," said leading trainer Andrew Balding, who has looked after a number of the queen's horses, and knows he has to keep them in peak condition.
The Queen's keenness extends to low-key visits in a private capacity to racetracks such as Newbury, which is in the Royal County of Berkshire, to check on the progress of her horses.
"Most of the crowd would be unaware she is there, walking around the paddock, possibly wearing a head scarf," revealed Attenborough, whose organization is responsible for promoting horse racing in Britain.
While Queen Elizabeth will not hand over the reigns of her racing operation anytime soon, Attenborough is confident that she will find a suitable successor.
"They are a family that understands traditional values and understand the value of succession," he said.
"It can be traced back to Queen Anne's day."
Queen Anne designated an area of land near Windsor to equestrian pursuits in 1711, and it later became Royal Ascot.
The Queen Anne Stakes, a Group One race that takes place every year at Royal Ascot, is named after the monarch who was so influential in the history of thoroughbred racing.
Attenborough, and the whole of the UK racing industry in the UK, are hoping that the latest edition to the Royal family -- Prince George of Cambridge -- will be just as keen.
They sent a special gift of a teddy bear, dressed in the queen's racing silks, to the maternity wing of the London hospital where he was born in July.
For now, Attenborough is delighted to have the queen as a figurehead to their sport, particularly as it is now competing for audiences with counter attractions such as the English Premier League and team sports like rugby and cricket.
"Fantastic for us as she has to be the most high-profile figure in Great Britain with a standing all round the world and it is hard for any country in the world to have a more prominent figurehead in their sport," he said.
Her star horse Estimate will likely return to Ascot on October 19 for the grand finale of the British flat racing season, the QIPCO British Champions Day, looking to repeat his earlier success on a course on which he has never been beaten, in the Long Distance Cup.
Estimate will likely face stiff competition from horses owned by other royal families, with the rulers of the Gulf states, notably Dubai's Sheikh Mohammed bin Rashid Al Maktoum, whose powerful Godolphin operation has been a major force in British racing for over 20 years.
Attenborough believes the royal connections, with long standing owner breeders like the Aga Khan and the queen now competing against relative new entrants such as Sheikh Mohammed, can only serve to maintain interest in sport of the turf in the 21st century.
"Their involvement is a fantastic boost for British and European racing," he said.