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26 November 2021 HIGH PREGNANCY RATES IN TWO-YEAR-OLD WILD HORSES
Lisa Grant, Rob Sharp, Paul Griffin, Julie Weikel, Leon Pielstick
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Abstract

In November 2018, we screened 315 feral Horse mares via veterinary rectal palpation and trans-rectal ultrasound, approximately 1 mo after their capture and removal from the Warm Springs herd management area in Oregon. We documented a pregnancy rate (58.3%) in 2-y-old mares that was nearly 3 times higher than previously published results. For 1-y-old mares (10.8% pregnant), and for mares pooled over all ages (64.4% pregnant), pregnancy rates were within the range of pregnancy rates reported from other feral Horse populations. High pregnancy rates in 2-y-old mares could contribute to higher than expected herd growth rates in feral Horses.

Lisa Grant, Rob Sharp, Paul Griffin, Julie Weikel, and Leon Pielstick "HIGH PREGNANCY RATES IN TWO-YEAR-OLD WILD HORSES," Northwestern Naturalist 102(3), 252-253, (26 November 2021). https://doi.org/10.1898/1051-1733-102.3.252
Received: 18 December 2020; Accepted: 21 January 2021; Published: 26 November 2021
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KEYWORDS
demography
feral
herd management
horse
pregnancy
ultrasound
wild
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