In the early stages of illness, deer activities decreased, limbs became stiff, and gait was severely restrained. Then standing was difficult. Even several struggles to stand up were required, and most of them showed limp. Breathing speed, heart rate increased. Feces become thinner and have a special acid odor. In the later stages of the disease, my heart beats faster, my heart rhythm is irregular, my heart murmurs, my appetite disappears, I can't afford to lie in bed, and myopia is reversed. My heart is paralyzed and my breathing is difficult. The deceased deer corpse is stiff, the visible mucous membranes are pale, and the skeletal muscles are gray-red or pale in color, resembling fish-like color, soft and juicy, like meaty. The interstitial muscles are loose and there are multiple layers of yellow gel-like infiltrate in the connective tissue. The main feature is the grayish white muscle fiber bundles with normal intermuscular inclusions and necrosis. Muscle cross-section with white bundle necrosis. The heart expands softly, and the heart muscle becomes thin and fragile. It is pale reddish-brown and has a light yellow turbid and irregular light streak along the muscle fibers. The cross-section shows myocardial necrosis with gray and white sizes. Coronary steatosis, transparent gel-like appearance. The liver is swollen, hard and brittle, with a rough surface, pale in color, with diffuse punctate haemorrhage, and a large area of ​​fatty degeneration, showing a yellow, red, and gray pattern. The spleen capsule is gray and white, and the red pulp, white pulp, and spleen trabeculae are clearly visible on the cut surface. The kidneys are swollen, congested, and are essentially spotted and gray necrotic lesions. Pulmonary congestion and emphysema. The anus is contaminated with faeces. The gastric mucosa is flushed and edematous and covered with a large amount of transparent mucous, with a bit like or streaky bleeding. The small intestine contains faint, liquid-like malodorous yellowish or grayish stools, occasionally reddish mucus, mixed with air bubbles, small intestine mucous flushes, thick mucus, or bleeding spots. Intestinal lymph nodes swollen, submucosal and muscular edema, mesenteric lymph nodes. During the prevention and treatment, the sick deer were injected subcutaneously or intramuscularly with 2% ml of sodium selenite. At the same time, vitamin 25 mg was injected every 2 days for a total of 35 injections. The use of this medicine to prevent the injection of newborn deer can also receive satisfactory results. Fundamentally prevent the need to purchase feeds from selenium-deficient areas and add selenium-containing additives to the feed. China Agricultural Network Editor
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