The diagnosis of early pregnancy by veterinary ultrasound can significantly promote the completion of breeding rate in adult cows. From the comparative analysis of the breeding rate data of young cattle, it can be seen that there is not much difference in the completion of breeding rate among young cattle (P>0.05), and the decrease in one breeding rate may be due to the adjustment of herd structure or the need to regulate calving distribution.

The use of animal ultrasound for early pregnancy diagnosis and strengthening reproductive program management has two purposes:

Early understanding of breeding and pregnancy status, timely monitoring of the progress of breeding work. For pregnant cows. We should know its general situation, which cannot be used as a basis for determining the pregnancy at this time.

Accurately identifying empty cows and knowing the proportion and individuals of empty cows as early as possible is what we need to truly grasp. The application of B-ultrasound for early pregnancy diagnosis in cow breeding work has detected in advance cows that have not returned to mating and are actually empty. This enables early technical treatment and therapy of this group of cows in production, and enables them to participate in monthly breeding plans as soon as possible. This technical process can be used to improve the actual effective completion rate of breeding and provide effective guarantees for breeding work.

Overall, the mating rate of young cattle is uniform and stable, and the role of veterinary ultrasound has been downplayed. However, from another perspective, we should recognize that under the high temperature conditions in southern summer. The breeding work of young cattle can play a certain buffering and regulating role in the reproductive indicators of the entire population.