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Home›Successful foaling›Meet our sweet and exuberant Persian evening primrose filly

Meet our sweet and exuberant Persian evening primrose filly

By Linda J. Sullivan
September 3, 2021
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Our team trained the evening primrose to voluntarily urinate at the right time, making it easy for us to collect a sample for our endocrine lab to analyze. To perform the behavior requested of them, our evening primrose receives positive reinforcement in the form of a favorite food: apple cookies. This training was a non-invasive and stress-free way for us to collect Sayeh’s hormones for analysis.

Once we determined that Sayeh was in estrus, we put her together with the filly’s sire, a 14 year old stallion named Mandrake, for breeding. This training also allowed us to confirm Sayeh’s pregnancy and to follow her progress. Typically, gestation lasts 365 to 368 days. Our new filly is one of 48 Persian onagers born at SCBI since the start of the breeding program in 1975.

Fun facts about Persian onagers

  • Evening primrose, in general, have very strong personalities. They are quite intelligent and irascible, so they often let the keepers know what they are thinking in no uncertain terms! But, it also makes working with them and gaining their trust a very rewarding part of our job.
  • One of their most amazing adaptations is their ability to withstand extreme temperatures. Persian onagers are native to the semi-desert region of Iran, where they can reach up to 120 degrees Fahrenheit during the day. In this environment, leaves and grasses provide evening primrose with most of the water they need to survive, which sets them apart from other equine species. While a Przewalski horse can drink up to 12 gallons of water per day, a Persian evening primrose can only drink 1.5 gallons.
  • One way to differentiate Asian wild asses from most domestic horses is their “brown stripe,” a dark brown band that runs down their spine from mane to tail. Persian onagers, Przewalski’s horses, and domestic donkeys all have this trait.

This story appears in the September 2021 issue of National Zoo News. Want adorable pets in your inbox? Sign up for zoo emails!


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