Before conducting B-ultrasound testing on cows, we use a calendar month (i.e. 30/31 days, pay attention to February!). If the animal breeds on the 15th, it can be scanned on the 15th of the following month, which results in high accuracy of the scan (i.e. no further improvement in accuracy thereafter) and ensures that the heartbeat can see whether the fetus is still alive. (That is, if the heartbeat does not exist, then I am happy to confirm that the fetus has died.)

So, when should we have a pregnancy check-up earlier (instead of 28 days) to provide us with accurate pregnancy information?

Before ensuring the viability of the fetus can be checked (i.e. observing heartbeat), it is meaningless to conduct a pregnancy test. Therefore, I bring your above viewpoint to you. I did not use ET to handle herds, but rather worked in a practice where customers are widely distributed, so it is impractical to conduct multiple checks on each cow. If you only work on one farm, or if your client's farm is nearby, earlier exams may be helpful, but that's not my personal experience. I will adhere to the individual exams as described above.

link: https://www.bxlimage.com/nw/419.html