It is very common for farmers to have diarrhea during the breeding of calves. Yak diarrhea has no obvious seasonal and regional characteristics, and is prone to newborn calves within 3 weeks to 1 month of birth. The main symptoms are vomiting, dehydration, loose stools, weight loss, etc., and the disease is the main cause of dysplasia and death of yak. ​​How should farmers control it? I. Analysis of the cause of yak diarrhea 1. The physiology of yak is not perfect. The faecal organs and functions of yak from 3 weeks to 1 month of age are not yet fully developed, so they do not have digestive function. When it sucks, it reflexively causes the esophageal groove to close, thereby forming a tubular structure, and milk enters the abdomen through the esophageal sulcus and the valvular stomach for milk digestion. The yak sometimes allows a small amount of milk to enter the stomach and rumen, while the net rumen and rumen of the newborn yak are not fully developed. The function of digesting milk does not cause the milk to stay in the stomach for a long time to produce lactic acid fermentation and cause diarrhea. In addition, the yak's neuromodulation and immune system have not yet fully developed. These physiological factors are combined to make the yak less adaptable to the environment, poorly resistant, and vulnerable to the invasion of pathogenic microorganisms to cause diarrhea. 2, feeding management factors (1) Cow malnutrition during pregnancy The development of yak cattle is affected to some extent by the nutritional status of pregnant cows. If the nutrition of the cows in the dry period is not well supplied and the fetus is malnourished, the yak produced is generally weaker and has a higher probability of developing diarrhea. At the same time, the lack of nutrient supply of the cow results in late lactation and less milk, and the nutritional content of the milk is not good, which causes the yak to have diarrhea. (2) The management of yak breeding is unscientific. It should be fed colostrum within 0.5~1h of the birth of yak. ​​The gastrointestinal function of the yak is increased and the risk of disease is increased. Nowadays, the yak colostrum feeding management often adopts the method of artificial breastfeeding and fails to be quantitatively quantified. The temperature of the milk is also uncontrolled, and the lack of feeding management leads to diarrhea in the yak. In addition, poor sanitary conditions and poor quality of yak food feed are also important causes of yak diarrhea. 3. External environmental stress and pathogenic microbial invasion External environmental stresses such as sudden changes in the weather, sudden drops in temperature, damp rain, and sudden changes in the environment can also cause yak diarrhea. At the same time, the invasion of pathogenic microorganisms, such as common Salmonella, Escherichia coli, coronavirus, and rotavirus, poses the greatest threat to yaks, while the dehydration causes yak death. Second, the clinical symptoms of yak diarrhea The diseased oyster steak has a watery stool, an odor, and a different stool color. It is usually yellow or white or a small number of diseased yak loose stools entrain blood and mucous membranes. In the initial stage of diarrhea, the steak is discharged first and then naturally discharged. As the disease progresses, the yak begins to fall ill and dies within 24 to 96 hours. The mortality rate of yak diarrhea is as high as 80%. Of course, due to the different pathogenic factors, there will be some differences in clinical performance. Third, treatment measures The treatment of yak diarrhea should first be accurately diagnosed based on clinical manifestations and then effectively treated. First, the diseased calves should be placed in isolation in a clean, dry, warm enclosure and then proceeded to treatment. Treatment should follow the principles of “intestinal cleansing, promotion of digestion, anti-inflammatory, anti-dehydrationâ€, and treatment by adopting intestinal protective agents, supplementing body fluids or applying systemic antibiotics. According to the degree of diarrhea and clinical symptoms of sick calves, corresponding measures are taken in time. For example, yak with mild diarrhea is mainly used to adjust gastrointestinal function, and it can be digested by feeding Chinese medicine prescription Sishen Pill and other digestive drugs. For yak with moderate diarrhea, astringent antidiarrheal agents such as oral charcoal, niacin, and bismuth subcarbonate can be used for treatment. The application of such drugs should be noted that the drugs are only suitable for sick cattle with little odor and diarrhea; for yak with severe diarrhea, antibacterial and anti-inflammatory measures should be taken together with rehydration and detoxification treatment. Ling or sulfa oxime to antibacterial and anti-inflammatory, with 5% compound sodium chloride injection or glucose normal saline to replenish and detoxify, with 50 ~ 100m L concentration of 5% sodium bicarbonate solution by intravenous injection to relieve acidosis. No matter what causes yak diarrhea, the obvious symptoms are acidosis, dehydration and loose stools. Therefore, farmers should take the principle of comprehensive treatment to do the work of laxative and antidiarrheal, and take intestinal protective agent and body fluid in time. 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