In Chen Zhifei, Shenyang Animal Health Supervision Institute, cows and sheep eat too much tender grass every spring and summer, and ferment rapidly in their stomachs, producing a lot of gas that is not easy to be excreted, causing abdominal distension, commonly known as grass swelling, that is, rumen gas. Symptoms The abdomen of sick animals expands rapidly, especially the left abdomen is obviously protruding. I feel nervous and elastic when I buckle with my hand, and my voice is like a drum. Sick cows are depressed, don't eat, don't ruminate, groan uneasily, often look back at their abdomen, stand still, bend over, urinate frequently, and it is more and more difficult to breathe. In severe cases, they will die immediately. Prevent the change from house feeding to grazing in the first week or two, and feed some hay before grazing. When grazing, it is found that cattle and sheep are angry, so other cattle and sheep should be driven to places with less grass to avoid further diseases. The treatment method (1) leads the sick animal to the slope, one person opens its mouth, and the other person massages the swollen part with both hands, or puts a small wooden stick horizontally in its mouth, and the two ends of the wooden stick are tied to its head with ropes, and then massages, so that the gas in the stomach can be discharged from its mouth. ② Take an inhibitor, such as formalin, cattle 10 ~ 20ml, sheep 1 ~ 3ml, while expelling the gas in the stomach. ③ When the sick animal is in crisis, puncture and deflate with trocar at the highest position of left abdominal distension.