This video shows bovine fetal development from 38 (6 weeks) to 66 (10 weeks) days in a herd of bull bred heifers. (All of the images were collected using the 4.0 MHz convex rectal probe and the "ReproArm" extension arm. The dates are approximate. The ReproScan XTC has the 1 cm grid turned on. Viewers can see the increase in size and the stages of fetal development. Correlating size, stage of fetal development with age in days or weeks will allow the scanner to determine age of fetus quickly. If you have any questions, comments or suggestions about this video, please contact ReproScan at inquiry@repro-scan.com