Breeding Season in Oklahoma — Mare-Prep Timeline | Oak Grove Veterinary Hospital

Small animal + equine care in Coweta

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Mare care guides · Coweta, Oklahoma

Breeding Season in Oklahoma

Foals arriving in January start as decisions made the previous fall. Oklahoma’s breeding season rewards the owners who prepare in winter: lights on in late fall, exams in winter, and stallion contracts signed before the popular books close.

Vesper Martini winning the 2025 Speedhorse Graham Paint & Appaloosa Stakes (G1) at Remington Park
30 years of
reproductive excellence.

The mare-prep timeline, fall through spring.

Early foals are made in the fall. Lights, exams, stallion contracts and cycle management each have their window — miss one and the whole season gets harder.

The calendar that works

Dr. Ross has managed mare breeding programs across northeast Oklahoma for 30 years.

Late November–December: lights on
Mares are long-day breeders. Sixteen hours of light a day starting around Thanksgiving pulls the first ovulation forward — the standard approach for January and February foals.
December–January: book the stallion
Popular stallions’ books close early, and shipped-semen contracts take paperwork. Decide the cross before the season decides for you.
January: the pre-breeding exam
Reproductive exam, uterine culture and biopsy where indicated, a Caslick’s check, plus vaccination and dental review. Problems found now are still fixable now.
February–April: breed on the cycle
Teasing and ultrasound tracking, insemination timed to ovulation, then pregnancy checks at 14–16 days and again around 28–30 days.

Decisions to make early

Fresh, cooled or frozen
Each option changes the calendar and the cost. We work with all three and will tell you honestly which fits your mare and your stallion.
Embryo transfer & recipients
For mares who can’t or shouldn’t carry, embryo transfer into a recipient mare keeps the genetics moving. Planning starts before the flush, not after it.
The Oklahoma Bred angle
Foals bred and foaled in Oklahoma position for Oklahoma Bred incentives — worth factoring into stallion and foaling decisions from the start.
Breeding season Lights program Mare exams Stallion booking Oklahoma Bred

Serving mare owners across Oklahoma — Coweta, Broken Arrow, Wagoner, Tulsa, Bixby, Jenks, Owasso, Pryor and Muskogee.

Get on the calendar.

Books close and seasons don’t wait.

Mare care guides.

Season calendars and pregnancy timelines from our reproduction program — plan the breeding year before it plans you.

Caring for the pregnant mare

Trimester by trimester — feeding, the EHV-1 series, and 30-day-out foaling prep.

Read the pregnant mare guide

Foaling emergencies

The normal foaling timeline, red bag, dystocia, and the calls that can’t wait.

Read the foaling guide

Oklahoma Bred

How the Oklahoma Bred program works, and why where a foal is bred and born matters.

Explore Oklahoma Bred

Plan your visit

We’re easy to reach.

918-486-VETS
Find us

12949 South State Highway 51
Coweta, Oklahoma 74429

Weekdays

Monday–Friday · 8:00 AM–5:30 PM

Weekend

Saturday · 8:00 AM–12:00 PM
Sunday · Closed

Emergency

Emergencies don’t keep office hours. Call (918) 486-8387 — after hours, the recording explains how to reach us.

Oak Grove Veterinary Hospital roadside sign on Highway 51 in Coweta
Call 918-486-VETS