First trimester (days 1–90)
- Confirm the pregnancy
- Ultrasound at 14–16 days, and again at 28–30 days to check for a heartbeat and rule out twins — twin pregnancies in mares rarely end well, and they are managed early or not at all.
- Hands off, mostly
- Normal work and riding are fine. Where you can, avoid stress and shipping in the first 60 days.
- Start the vaccine plan
- Core vaccines stay current; the EHV-1 (rhino/abortion) series begins at month 5. Set the calendar now, not later.
Second trimester (months 4–7)
- EHV-1 at 5, 7 and 9 months
- The abortion-prevention series. Put the dates on the barn calendar the day the mare is confirmed in foal.
- Deworm on schedule
- Regular deworming continues through pregnancy. We tailor products and timing to your pasture and fecal results.
- Feed the mare, not yet the foal
- Most fetal growth is still ahead. Hold body condition steady — a mare who enters late gestation thin is hard to catch up.
Third trimester (months 8–11)
- Feed the growth
- The foal gains most of its weight now. Energy, protein and mineral needs climb — ration balancers and broodmare feeds earn their keep.
- 30 days out: boosters & Caslick’s
- Pre-foaling vaccinations about a month before the due date build the colostrum antibodies the foal depends on. A Caslick’s is opened two to four weeks before foaling.
- Watch for warning signs
- Premature udder development or dripping milk, vulvar discharge, colic, or a mare who is “just not right” — call the same day, not the next morning.
Pregnant mare
EHV-1 vaccine
Foaling prep
Colostrum
Twin checks
Serving mare owners across Oklahoma — Coweta, Broken Arrow, Wagoner, Tulsa, Bixby, Jenks, Owasso, Pryor and Muskogee.
