Oh it's all very perverse Aries.
I've mentioned on other freds that I work in the ultra-glam world of racehorse breeding (or horse prostitution as HWHNN likes to call it)
. If we mere human women got half as much fertility assistance as these flippin mares we'd all be diffed in no time:
All of the mates have their cycles charted in a book/file.
When you think they're due to come into season they're put to the Teaser (poor boy, he gets to have a sniff and a look but NO ACTION)
If she's not ready she'll kick and lash out. If she is in season she'll stand still and (this is the bit that makes me laugh) "wink" at him. And no I don't mean with her eyes - she lifts her tail and flashes her lady parts at him [hussy]
She's then whisked off to be seen by the vet who will scan her ovaries to check for a follicle. If the follicle is big enough she'll be booked to the stallion that day, or if not she'll be scanned again every day until the follicle is big enough.
Once she's been to the stallion (we call it "covered") she will be brought back for the vet 12 days later and scanned for pregnancy.
If she's not in foal she gets a shot of progesterone to restart her cycle straight away.
Life would just be sooooo much easier that way!