Big thing with PG is that it needs to be done after she has cycled normally, as in about a week, as otherwise you can mess up the development of the follicle due to the corpus luteum not being ready to make another oocyte.
We had a silent heat mare AI'd, and needed to use prostaglandin. However, we didn't get and shakes or sweating. If you know how to do an injection you can do it yourself, but you can't if you are pregnant. If you are pregnant and some PG is absorbed through your skin, your baby will abort. And in terms of ultrasounds, she had one to check out everything and when she would ovulate, we were given dates that we could give the PG and then had a couple (2-3) of ultrasounds to see when the best time to insert semen. The a 2 weeks wait, then another to confirm in foal.
The PG shot we gave was on the friday, and our mare came into cycle on Tuesday. So it is pretty quick. But this also means you can save on transports costs if it is early in the week, and you won't have to worry too much (hopefully) about missing her ovulation.
Best I know is that from then on that's her cycle, as her body still needs to undergo the ovulation, and reformation of the corpus luteum before she can ovulate again, and this will be the 21 days or so after the last ovulation.
Hope this helps!
Last edited by Jacqua Stud; 03-13-2013 at 08:31 PM.