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Pierson RA, Ginther OJ. Ultrasonography for detection of pregnancy and study of embryonic development in heifers. Theriogenology. 1984;22(2):225-33doi: 10.1016/0093-691x(84)90435-7.
Pierson, R. A., & Ginther, O. J. (1984). Ultrasonography for detection of pregnancy and study of embryonic development in heifers. Theriogenology, 22(2), 225-33. https://doi.org/10.1016/0093-691x(84)90435-7
Pierson, R A, and Ginther, O J. "Ultrasonography for detection of pregnancy and study of embryonic development in heifers." Theriogenology vol. 22,2 (1984): 225-33. doi: https://doi.org/10.1016/0093-691x(84)90435-7
Pierson RA, Ginther OJ. Ultrasonography for detection of pregnancy and study of embryonic development in heifers. Theriogenology. 1984 Aug;22(2):225-33. doi: 10.1016/0093-691x(84)90435-7. PMID: 16725953.
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