An ejection fraction is most commonly measured during an echocardiogram. 1  This painless and noninvasive test uses high-frequency sound waves (ultrasound) to get a picture of the four heart chambers and the four heart valves. Ejection fraction can also be measured as part of other diagnostic testing, such as: 1  MUGA Scan: A type of radionuclide imaging test that provides clear pictures of blood flow through the heart's chambers and blood vessels.
Horses have a gestation period that lasts approximately 340 days. If that sounds like a long time to wait for the baby to be born, youâd be no better off raising llamas (350 days) or donkeys (365 days).
The average pregnancy length in themare is 336 to 340 days, but horses have a widevariation in pregnancy lengths (normal foals havebeen produced from pregnancies as short as 305days and as long as 400 days), making it difï¬cultfor the horse owner to predict the actual date ofbirth.