The number that nobody at the races thinks about
In 2025 there were 107 stallions standing at stud in Britain, down from 147 in 2021. That figure sits behind every race the country runs. Every two-year-old on a Newmarket card, every handicapper at Wincanton, every Gold Cup winner – all of them were produced by a small population of sires whose shrinking numbers are reshaping what fields look like and how the racing product will evolve over the next decade. Most punters do not know the number exists. The yards and the Tattersalls agents who buy yearlings know it well, and it dictates a lot of what they do.
British breeding is the part of racing’s supply chain that most directly affects the product punters bet on. Fewer stallions means fewer foals, smaller subsequent crops, tighter fields and shifting handicap dynamics. This piece is about what the British breeding sector looks like in 2026 and why its contraction should matter to anyone betting on the racing it produces.
Stallion ratio explained
British thoroughbred breeding has the highest stallion-to-broodmare ratio of any major racing jurisdiction: roughly one stallion to 60 broodmares. By comparison, Ireland’s equivalent ratio sits much lower, with more stallions covering fewer mares each. The British concentration is a structural feature of the market – a few commercially successful stallions cover very large books while the tail of less popular sires struggles to attract enough mares to remain viable.
The 2025 figure of 107 stallions is sharply down from 147 in 2021. A 27% decline in four years is not normal industry evolution; it is a structural contraction driven by economic pressures on the breeding sector. Nomination fees at the commercial end of the market – the top stallions at Coolmore and Dalham Hall – have held up or risen, but the middle and lower end of the market has shrunk as stallions that historically covered 60 or 80 mares a year are unable to fill their books at rates that justify their standing fees.
The Thoroughbred Breeders’ Association flagged the trend through 2024 and 2025. TDN’s Cutting Comment coverage of 2025 identified the stallion shrinkage as the single most important supply-side concern facing British racing, because a smaller stallion population produces proportionally smaller subsequent foal crops with a multi-year lag before the effects become visible on the racecourse.
New retirees to stud
Only three new stallions retired to British studs for the 2025 covering season, according to TBA AGM proceedings. Three retirees against a backdrop of natural stallion attrition – ageing, retirement from service, relocation to other jurisdictions – means the British stallion population is not replenishing at the rate required to stabilise the pool, let alone grow it.
The pattern is driven by commercial economics. Retiring a Group 1-winning colt to stud in Britain requires the syndicate owners to agree that British standing produces better returns than standing in Ireland, France, Japan or the US. For many years Britain could compete on prestige and infrastructure; increasingly the economics favour Ireland (lower tax, larger international book-building) and non-European jurisdictions (for horses with specific regional appeal).
A horse that could have retired to stand in Britain but instead stands in Ireland produces foals that may still race in Britain but generates none of the direct British breeding activity – no nominations sold to British breeders, no foals born on British farms, no downstream employment at British studs. The cumulative effect of these decisions over several years is the 147-to-107 compression visible today.
Broodmare population
The broodmare population supporting British breeding is the other side of the ratio. With roughly 60 broodmares per stallion, a population of 107 stallions implies a British broodmare pool of around 6,500 active broodmares at the current ratio. That figure has also been under pressure, though the contraction is gentler than the stallion shrinkage.
Broodmare economics differ from stallion economics. A commercial breeder decides whether to keep breeding based on yearling sale returns, maintenance costs on the farm, and the quality of stallion options available for mating decisions. When stallion options shrink or shift offshore, the calculation for breeders worsens, and marginal broodmare owners drop out of the business.
The interaction between stallion availability and broodmare retention is the core supply-side risk. Fewer stallions produce fewer covering options, which reduces the genetic range available to British breeders, which makes their yearlings less commercially competitive at the sales, which reduces the income that sustains their broodmare operations. The feedback loop has been running for several years and is now visible in the reduced foal crops and the quality distribution of the horses those crops produce.
Links to runner quality
The supply-side contraction has not yet translated into a visible fall in runner quality at the top end. In 2025 Britain fielded 1,423 Flat runners rated 90 or higher, almost identical to the 1,398 recorded in 2024, and 489 Jump runners rated 135 or higher against 490 in 2024. The elite pool is holding.
What has shifted is the middle-class handicap population – the bulk of horses producing the weekly cards through the calendar. The 2025 BHA Racing Report projected that the number of runs in Britain in 2027 will be 6 to 7% lower than in 2024, driven in part by the shrinking horse population and in part by specific fixture-list changes. Fewer horses running means fewer fields, smaller fields, or both. Punters experiencing eight-runner handicaps where they used to see twelve are seeing the breeding contraction work through to the raceday product.
Total UK racing prize money of £153 million in 2025, up from £148.3 million in 2024, with Flat up £3 million and Jump up £1.7 million, has held up in nominal terms. But prize money distributed across fewer races and smaller fields means a different allocation per runner, and the competitive dynamics of the sport will evolve as the horse population contracts further.
Why punters feel it
The breeding contraction shows up in punters’ experience in several specific ways. First, field sizes are shrinking across lower and middle-grade cards. A race that was routinely twelve runners in 2019 might now be eight or nine; a race that was sixteen in 2019 might now be twelve. Smaller fields change the draw dynamics, the place-terms economics (fewer runners means fewer places paid) and the handicap pressures (less weight spread across a smaller field).
Second, the quality distribution within a given class is shifting. Class 4 handicaps are being contested by horses that might historically have been rated higher and moved out of the class by now, because the replacement pool is smaller. That produces more stable handicap horses – longer-tenured runners at the same rating – but also slightly less competitive races, because the very-well-handicapped angles that fuelled value handicap betting in the past have been flattened.
Third, the top-end sales prices have risen, compressing ownership at the commercial end of the sport. The £1.47 billion in direct revenues and £4.1 billion total annual contribution to the UK economy documented by the British Horseracing Authority rests on a breeding base whose economics are deteriorating. BHA Chief Executive Brant Dunshea’s recent comments on the Levy outcome – “Adding more red tape to an already highly regulated sector will only fuel a significant rise in illegal betting, deprive horseracing of funding and prevent the Government collecting millions of pounds in much-needed taxation” – apply equally to the breeding supply chain, where the combination of lower Levy income, shrinking betting turnover and operator margin pressure is directly eroding the economic base that supports British studs and broodmare operations.
The connection between the number of stallions and the races on next Saturday’s card is not immediately visible but it is direct. Punters who understand the supply-chain dynamics can read the reducing-field trends and the quality shifts more accurately than those who assume racing’s product is stable. The pillar on betting at horse racing covers the wider economic context in which breeding sits.
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Written by the editors at bettingathorseracing.com.
