So yours, except the one, are never retired fully into breeding and are always ridden?
I think I know the answer to this but. Are some mares never broke and bred because of what's on their pedigree?
Some people just use the mares as broodies and don't do a thing with them.
I never particularly subscribed to that because I enjoy riding and showing too much. When the economy started to slow down and horse sales got slower and more horses started ending up in rescues or at the auction, I decided I wanted to make sure everyone had the safety net of having a 'job' to fall back on should something ever happen to me or they couldn't be bred again for whatever reason. So, starting about 10 years ago, I started with the eldest and started getting them all under saddle. At that point I had around 20 mares. Up til then, we'd primarily been a halter barn but now we've come full circle and hardly show halter at all, LOL!
Funny thing was, once they were under saddle and being ridden, they also got sold! I'm now down to 4 mares, 3 foals, 1 stallion and 1 gelding! And working on moving at least 2 more babies on before winter, I hope!