When I first got into breeding - YEARS
ago - I remember my vet telling me that through the years, the standard conception / successful foaling rate was 60%. And if you took the last 50-60-70 years, there might be some blips above or below that but on average based on mares bred and live foals born, east coast, west coast, north and south, WB's, TB's, Quarter Horses, big breeders, backyard breeders, etc it has stayed constant at 60%
So ... that is also going back to the days when you "stuck that mare in with that there stallion and let 'im have a go at 'er a few times", before ultrasounds, before P&E protocols, forget about oxytocin or Regumate or checking progesterone levels. No such thing as fresh cooled semen, let alone frozen. If you couldnt ship your mare to the stallion or he didnt come and visit your mare, she didnt get bred - it was that simple ...
If you were lucky, that cow vet up the road could stick his arm up there and feel around and tell you if he thought she was pregnant as well
With all of our advancements and new fangled protocols and drugs and equipment at our disposal, I would venture to say that we are STILL
at that median 60% success rate and have not deviated from it one iota
Are any statistics kept on something like this? Does anyone feel that it has actually increased at all as we approach breeding in a more scientific and structured manner or by doing so, have we actually DECREASED
the conception rates as we are trying to micromanage something that should really be very very simple instead ...