There are many methods for the pregnancy examination of dairy cows, and the most widely used in current production practice is to judge according to the changes of the cow's body surface. The first is that the cows no longer exhibit periodic estrus, the temperament becomes meek, and the action is steady, and grazing or escaping often falls behind the herd. After 3 months of pregnancy, appetite increased, food intake increased, sensation became better, weight increased, and the coat was lustrous. The first producing cow could touch a lump in the breast and some cows showed heterophilia. After 5 months, the abdominal circumference increased rapidly, the milk production was significantly decreased, and the pulse and respiratory rate also increased significantly. At the time of the first cow production, the breasts rapidly expanded, the nipples became thicker, and the highly viscous secretions could be squeezed out. Pregnant cows are water-like). At 6 to 7 months of pregnancy, a stethoscope can be used to hear the heartbeat of the fetus (the heartbeat of a pregnant cow is 75-85 beats/min, and the fetus is 112-150 beats/min), and the fetus can be seen in the abdomen Rotation in the mother's body, especially before feeding and drinking in the early morning. In the 8th month of pregnancy, the cow's abdominal circumference is larger, and it is easier to see that the fetus turns in the cow's abdomen and umbilicus
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