There are many factors that can cause reproductive disorders in cows and diseases that cows are prone to. In typical dairy farms, there are two common types of reproductive disorders: endometritis and hormone imbalance. These reproductive disorders in cows are preliminarily screened through Veterinary Ultrasound.

In the practice of dairy cow breeding, most cases of endometritis are caused by improper handling during or after calving, or insufficient uterine contractions leading to lochia retention and bacterial overgrowth. This can be clearly observed through animal B-ultrasound observation of the uterine environment. Various methods of artificial insemination entering the vagina and uterus, such as improper operation and inadequate disinfection, are also important causes of endometritis. Therefore, in daily work, using veterinary ultrasound examination is very important.

After the removal of the new placenta in a cow, the epithelial cells of the uterus rupture, and the secretion composed of a mixture of mucus, blood, white blood cells, and fat is called lochia. Due to the open and bacterial environment during delivery, bacteria will invade all cows after calving. It is important to use veterinary ultrasound to observe cows after giving birth. The amount of bacteria in lochia depends on the hygiene conditions during delivery and postpartum period, as well as the delivery method during calving. Cattle with good health, clean environment, strong uterine contractions, and normal secretion of estrogen (causing congestion of the endometrium, increased white blood cell activity, and "self-cleaning") usually become sterile in the uterus after about 20 days. At this time, it is also necessary to use veterinary ultrasound to examine the condition of the uterus.

The presence of other types and colors of foul smelling substances in cow lochia indicates the occurrence of endometritis. If there is no lochia or mastitis within 10 days after delivery, a veterinary ultrasound examination must be used to check for endometritis. Various endometritis can affect the success of reproduction to varying degrees, so using ultrasound to examine the uterine environment in animals is a necessary means. Therefore, purifying the uterus is very important.