At the end of March, the technical teacher went to Pingdingshan and Ningxia to train customers on how to use B-ultrasound for cattle BXL-V50 for cattle. Both of these customers are cattle breeding, so a B-ultrasonography machine for cows is needed to do early pregnancy test for cows. . The use of a B-ultrasound machine for early pregnancy detection of cows can screen out those empty cows in advance, so that they can be bred for the next time as soon as possible, reducing the empty time.