Kastelic, J P Ultrasonic detection of the conceptus and characterization of intrauterine fluid on days 10 to 22 in heifers. [electronic resource] - Theriogenology Mar 1991 - 569-81 p. digital Publication Type: Journal Article ISSN: 0093-691X Standard No.: 10.1016/0093-691x(91)90453-k doi