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Sevinga, M., Barkema, H. W., Stryhn, H. E., & Hesselink, J. W. (2004). Retained placenta in Friesian mares: incidence, and potential risk factors with special emphasis on gestational length. Theriogenology, 61(5), 851-859. doi:10.1016/s0093-691x(03)00260-7

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