Horse Pregnancy (Gestation & Care): 2025 Vet Guide by Dr Duncan Houston 🐴🤰

Hello! I’m Dr Duncan Houston, veterinarian and founder of AskAVet.com. In this comprehensive 2025 guide, we explore every stage of mare pregnancy—from conception to foaling—and provide expert insights on gestation length, trimester care, nutrition, vaccination, foaling preparation, common concerns, and postpartum support. Let’s ensure both mare and foal thrive together! 🧠✨

📅 How Long Is Equine Gestation?

Horse gestation lasts approximately **320–370 days**, with the **average around 340 days (11 months)** :contentReference[oaicite:3]{index=3}. Individual mares may vary seasonally and by breed; colts typically carry ~4 days longer than fillies :contentReference[oaicite:4]{index=4}.

🔍 Stages of Pregnancy & What to Expect

First Trimester (Days 1–114)

• Embryonic development—placental attachment by ~Day 35–45, visible heartbeat by ~Day 23 :contentReference[oaicite:5]{index=5}.
• Mare shows minimal outward signs; pregnancy confirmed via ultrasound around Day 14–18 :contentReference[oaicite:6]{index=6}.
• Exercise safe; no major dietary change needed yet.

Second Trimester (Days 115–226)

• Fetal growth accelerates—organs and musculoskeletal development :contentReference[oaicite:7]{index=7}.
• Maintain balanced forage-based diet; introduce vitamins/minerals if forage quality low :contentReference[oaicite:8]{index=8}.
• Administer EHV vaccines at 5 and 7 months to reduce abortogenic risk :contentReference[oaicite:9]{index=9}.

Third Trimester (Days 227–340/365)

• Rapid fetal growth (~60% of total occurs during last 3 months) :contentReference[oaicite:10]{index=10}.
• Energy & protein requirements rise to levels similar to full training :contentReference[oaicite:11]{index=11}.
• Avoid tall fescue pasture in last 60–90 days to prevent fescue toxicosis :contentReference[oaicite:12]{index=12}.
• Pre-foaling vaccines (EHV-1, botulism, tetanus) given 4–6 weeks before due date to boost colostral immunity :contentReference[oaicite:13]{index=13}.
• Deworm mare 2–4 weeks pre-foaling to reduce parasite load at birth :contentReference[oaicite:14]{index=14}.

🏡 Daily Mare Care & Monitoring

• Ensure consistent turnout or light exercise to maintain circulation and reduce stress :contentReference[oaicite:15]{index=15}.
• Keep updated on vaccinations for EEE/WEE, tetanus – may delay until after first 90 days :contentReference[oaicite:16]{index=16}.
• Maintain hoof trimming, parasite control, clean stall rest—with safe companions to reduce stress.

⚠️ Common Reproductive Concerns

• Twin pregnancies: Detectable around Day 14–18; if twins detected, vet may recommend reduction due to high risk :contentReference[oaicite:17]{index=17}.
• Fescue toxicosis: Causes prolonged gestation, placental retention, agalactia—avoid infected pastures late gestation :contentReference[oaicite:18]{index=18}.
• Umbilical torsion, Mare Reproductive Loss Syndrome: Rare but serious—monitor during mid-late pregnancy :contentReference[oaicite:19]{index=19}.

🍼 Preparing for Foaling

• Around Day 315+, watch for signs like waxing teats, bagging up, tepid udder, and restlessness :contentReference[oaicite:20]{index=20}.
• Ensure a clean, well-bedded foaling stall or paddock; prepare essential supplies (sterile gloves, iodine, scissors).
• Have vet on call and discuss intervention plan for emergencies (red‑bag delivery, dystocia). :contentReference[oaicite:21]{index=21}
• Once foaled, monitor mare and foal—mare passes placenta within 3 hours; dip foal’s navel; check nursing within 2 hours :contentReference[oaicite:22]{index=22}.

📆 Postpartum Care

• Ensure foal stands and nurses colostrum within 2 hours; monitor foal’s health closely :contentReference[oaicite:23]{index=23}.
• Palpate mare for retained placenta; if not passed in 3 hours, call vet immediately to prevent metritis :contentReference[oaicite:24]{index=24}.
• Foal may receive enema to pass meconium; mare may need pain relief like Banamine if indicated :contentReference[oaicite:25]{index=25}.
• Wean foal between 4–6 months; ensure mare regains body condition before next breeding :contentReference[oaicite:26]{index=26}.

✨ 2025 Vet Pregnancy Care Checklist

🚀 Final Thoughts from Your 2025 Vet

Pregnancy in mares is a dynamic and rewarding journey. With attentive care, proper nutrition, targeted vaccinations, and vigilant monitoring, most mares deliver healthy foals after ~340 days. Early problem detection, vet support, and tools like AskAVet.com significantly enhance outcomes for both mare and foal. 🐎✨

📲 For cycle tracking, foaling alerts, expert advice, and postpartum check-ins—download the AskAVet.com app. Together, let’s make this pregnancy a success story. 💙