Ultrasound has become the most common and reliable method for early pregnancy diagnosis in mares.
Equine pregnancy ultrasound images.
Other significant characteristics of equine pregnancy include the presence of chorionic girdle cells from the fetal trophoblast which invade the endometrium.
Most equine practices own one of many commercially available portable ultrasound scanners.
Equine gestation timeline first trimester.
Initial pregnancy ultrasound and evaluate for twins day 18.
More details about this unit are given at the foot of this page.
Second pregnancy ultrasound heartbeat evaluate for twins days 45 60.
The vesicle is spherical and distinct and can be palpated from 18 d through 60 70 d and seen with ultrasound beginning at 10 or 12 d depending on the machine.
Date of ovulation days 14 16.
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Click on all images to see an enlargement.
For pregnancy diagnosis real time linear array b mode portable ultrasound machines that are fitted with a rectal linear array scanner or probe are used.
In addition transrectal ultrasound is often used to determine pregnancy especially if the mare has a history of twins or double ovulation.
Equine ultrasound pregnancy images.
Third pregnancy examination with ultrasound to confirm fetal heartbeat and viability of pregnancy.
Ultrasound has revolutionized equine breeding management over the last 20 years by providing accurate non invasive visual information on the mare s reproductive tract.
Additional ultrasound examination may be needed for evaluation of twins days 25 30.
The test is based on detecting elevated levels of equine chorionic gonadrotropin in the mare s serum between days 40 and 120 of gestation.
Estrone sulfate is produced by the fetus and is a good indicator of fetal viability.
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