Multiple choice How many days after breeding can a pregnancy be detected by ultrasound? Between 30 and 55 days Between 28 to 30 days Between 14 and 28 days Before 14 days Reveal answer Fill a bubble to check yourself B Correct answer Explanation Transrectal ultrasonography is a common diagnostic tool for pregnancy. While it can detect structures earlier, 28 to 30 days is the standard window for reliable pregnancy confirmation in dairy cattle.