Horse Side Vet Guide ®

Equine Health Resource

Pregnancy, Mare is Overdue, Over 340 Days Pregnant

Code Yellow - Contact Your Vet at Your Convenience for an Appointment

Code Green - Contact Your Vet to Obtain Useful Advice & Resources

Code Yellow - Contact Your Vet at Your Convenience for an Appointment

  • If you are concerned about the pregnancy or the mare and want an evaluation.

Code Green - Contact Your Vet to Obtain Useful Advice & Resources

  • You have any concerns about the late-term pregnant mare.

Mares commonly have gestation lengths longer than the average of 335-340 days, and this is a common concern to horse owners. Usually, there is no cause for worry. Gestation can be as long as 375 days and the record gestation length is over 400 days.

Of course, in the last weeks of pregnancy, a mare should show signs of advancing pregnancy. Her udder should be filling and her abdomen should be pendulous as she nears her due date.

WHAT TO DO

When in doubt, assess the mare’s general health using the Whole Horse Exam on Late-Term Mare (WHE), and contact your vet to discuss your findings and concerns. Watch and feel the mare’s flanks for movement of the fetus.

Keep an eye on the color of secretion from the teats by squeezing a drop or two into your palm every few days. As a mare nears foaling, the secretion will turn from clear, honey looking liquid to looking like real milk. (If your mare is exhibiting none of these signs, keep in mind that she may no longer be pregnant.)

Be sure to record the breeding dates, reproductive history of the mare and stallion including a record of prior foals and the years they were born. Supply all that information to your vet.

WHAT YOUR VET DOES

Your vet may advise you to take a “wait and see” approach or suggest that they examine your mare. They may perform a rectal examination and abdominal ultrasound to examine the fetus and placenta.

What Not To Do

Just because the mare was pregnant in the early stages of pregnancy, do not simply assume that she still is pregnant.

Helpful Terms & Topics in HSVGWritten, Reviewed or Shared by Experts in Equine Health

Author: Doug Thal DVM Dipl. ABVP

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