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From the 1960s to the present day, the British racehorse population has expanded, contracted, and reshaped itself in response to economics, breeding trends, training capacity, and the changing structure of the sport. In the early 1960s Britain typically produced around 4,000–5,000 foals a year, with roughly 6,000–7,000 horses in training at any one time. Not all foals reached the racecourse: only about 55–60% of each crop ever ran, meaning that in a typical year roughly 2,500–3,000 new horses actually made it to the track. The sport was smaller, more concentrated in traditional training centres, and dominated by owner‑breeders rather than commercial studs.
By the 1970s the foal crop had risen to around 6,000–7,000 annually, and the number of horses in training climbed to roughly 9,000–12,000. Economic growth, the arrival of major new owners, and the expansion of all‑weather gallops encouraged larger strings. Still, only about two‑thirds of foals ever raced. Many were retained for breeding, sold abroad, or failed to reach the track due to injury or lack of ability. The average horse that did race tended to run more frequently than today: a typical Flat horse might run 6–8 times per season, and a National Hunt horse 4–6 times, giving an average career total of roughly 20–25 starts.
The 1980s brought a boom. Foal crops exceeded 8,000 for the first time, and by the late decade approached 10,000. Horses in training rose to around 13,000–14,000. Commercial breeding expanded rapidly, fuelled by the success of Northern Dancer bloodlines and the growth of the sales market. Yet the proportion of foals that actually raced remained broadly similar: around 60–65%. The average number of races per horse began to decline slightly as training methods shifted toward fewer, more targeted runs, especially among high‑value Flat horses.
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