How long is a piece of string in our case !
2010 saw us breed our vanner to an RID. Couple of scans and off I dashed down the M40 to meet Avanti Amorous Archie. Shortly before I arrived Archie was collected from and after a quick cuppa and a pat of the big boy, I raced back up the M40 with my 'foal' in my husbands sandwich box (please don't tell him) which had been carefully packed in a cool box full of ice. Vet waiting and deed done. Heartbeat at 21 days and beautiful filly born on May 11th 2011. With microchip/vacs I would say foal came in at £950. The mare did not need much hard fed due to her type and she lived out throughout her term.
The foal was a stunner and a decision was made to breed again, this time to a big old fashioned TB in the hope of getting a lighter riding horse/lightweight show hunter stamp. 4 lots of semen + courier costs and no joy, umpteen scans and pg. Time is ticking away and we gave up. Fast forward spring of 2012 and we try again - no joy. Decision made to send the mare to stud - 300 miles south, for natural service in late May, she came home in foal in the last week of August. A cracking foal arrived this June and we are thrilled with him.
Cost £2,250. Stud fee plus a lot of collection and courier costs, transporter costs, livery and vet care whilst at stud, which is a bit frustrating as the mare is owned by a vet. I think the fact the mare caught on first AI in 2010 without any help from us would suggest that the second stallion's semen did not travel well (he is also a fair age), hence the reason she failed to hold until natural service.
To add insult to injury, the costs did not stop there. The in foal mare then had to be sent into full livery to be cared for in the last few months of her term, foaled and remains away at the moment, even more cost ! This unfortunate situation is due to my unforeseen ill health preventing me from providing proper care for the mare and foal. Baby is not registered yet, but if I have my way he will be called (farm prefix) - Broke the Bank. Because he certainly has !
So OP, the answer to your question is .........could be less than anticipated or a considerable amount more !
Good luck with whatever you do and I hope you have a healthy and correct foal.