Drews, B Early embryo development in the elephant assessed by serial ultrasound examinations. [electronic resource] - Theriogenology Jun 2008 - 1120-8 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 0093-691X Standard No.: 10.1016/j.theriogenology.2008.01.026 doi Subjects--Topical Terms: AnimalsElephants--embryologyEmbryo, Mammalian--diagnostic imagingFemaleGestational AgePlacenta--diagnostic imagingPlacentationPregnancyPregnancy, Animal--physiologyRetrospective StudiesUltrasonographyUterus--anatomy & histology