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This is not entirely accurate. While his “average” foal crop was 27 based on total number of foals sired divided by the number of years he covered mares. His “average” book was much higher than the “around 28”.
Most stud managers then and now know that around 20-30%+ of mare bred will not produce a foal. This “average” is easily found and has pretty much remained a consistent regardless of the size of a stallion’s book.
So taking this into account this would put his “average book” in the mid 30s. Without taking into account the number of shareholders and breeding rights.
He was originally syndicated into 25 shares plus breeding rights if memory serves. He was re-syndicated in the mid to late 70’s, might have been when he was moved to Maryland. The new syndicated was made up of 35-40 shares plus breeding rights. I have a copy of this agreement but can’t put my hands on it without digging around.
If memory serves his “normal book” after becoming well established was around 55+. Which was somewhat less than the “norm” for the era.
The writer of the article took a few “liberties” with historical facts. Bit of a fluff piece but a nice read.
“The sire himself had been passed over at $25,000 (as a yearling) . Soon he was earning $1 million for a one night stand”
“Soon” hardly, he went to stud in 65 he didn’t command the 1 million stud fee until the early 80’s if memory serves. My father bred (for a client) the highest price horse that has been sold to date at Saratoga in 84 who was by Northern Dancer. I believe the fee was $750,000. Would need to dig out that file for a fact check.
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The largest book he covered was 46 mares. I am pretty sure it was a 32-share syndicate, with 2 breeding rights for Windfields and one for Luro. The largest book any horse ever had at Windfields Maryland was the year Deputy Minister covered 57 mares. Most of them topped out in the low 50s.
Stallion book sizes changed dramatically after El Gran Senor made 120+ covers his first year at stud in 1985 with no ill effects. Until then, it was thought that it would be physically detrimental to a horse to breed that many times in a season.