Reproductive disorders caused by abnormal regulation of the reproductive organs of cows: The reproductive system of cows is mainly controlled by the central nervous system, but certain metabolites can be directly transported to the ovaries, uterus, and fetus. The interaction between the reproductive and lactation control systems can affect ovulation, estrus behavior, corpus luteum, and pregnancy maintenance. In addition to the rapid and direct response of the ovaries to metabolites, there is also a slow effect on the oocytes. At this stage, it is important to use imported cattle to observe the size of their follicles using ultrasound.

In terms of follicular mobility, the effect of diet on protein is related to the developmental ability of oocytes. Using ultrasound to observe the condition of follicles in imported cattle is very helpful for guiding the addition of diet. In high-yielding dairy cows, increasing the energy level of the diet can reduce the quality of oocytes and the efficiency of embryo development, resulting in a decrease in the number of follicles and a decrease in follicle productivity.

The ovaries have a certain degree of independence in stimulating the reproductive glands and can directly respond to metabolites, all of which are affected by high milk production in cows in the early postpartum period. Therefore, nutrition, environmental pollution, and some artificially synthesized chemicals can all lead to endocrine disorders, causing reproductive disorders in cows. In short, in the management of cow reproduction, it is best to use imported cows for B-ultrasound examination to detect problems and take timely preventive measures.

Reproductive disorders caused by environmental stress factors: Stress often refers to some environmental factors that can change the normal survival status of livestock. Under these stress factors, pregnant cows are prone to produce weak fetuses or low birth weight fetuses. In normal feeding and management, it is necessary to use imported cows to observe the condition of fetuses using ultrasound; The introduction of species from other places causes changes in the living environment, resulting in delayed initial estrus, lack of estrus, and environmental stress-induced reproductive disorders during the process of domestication.

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