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Depending on the date of the ultrasound the mare could still be pregnant under certain circumstances.

1) If the mare has many uterine cysts a pregancy could be mistaken for a cyst.

2) If the conceptus is not large enough to be observed at the time of the ultrasound.

(ex. the ultrasound is done at what is thought to be day 12 post ovulation but the conceptus is only at day 10).

3) The mare double ovulated and only the younger conceptus, which has gone unobserved, continues to develop. Usually, the veterinarian determines if the

mare has double ovulated during the course of each ultrasound.

If the mare does not return to heat as expected after a negative ultrasound she should be rechecked for pregnancy and, if open, the veterinarian may be able to

determine the rootcause for her failure to return to heat.

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Q: Can a horse be pregnant even if she has a negative ultrasound?
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