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Sheep Infectious Mastitis

Infectious mastitis of sheep (mastitis infectiosa ovium) is an acute contagious disease; manifested by gangrenous lesions of the mammary gland and severe intoxication of the body.

Etiology. The main causative agents of the disease are pathogenic staphylococcus - Staphylococcus sureus ovinus and Pasteurells haemelytica of biotypes A and T. Mastitis in sheep can also be caused by other microorganisms and their associations: Escherichia, Proteus, Clostridia, etc. Disease caused by pathogenic staphylococcus aureus, abscessed mastitis or flakes and pus. When opening abscesses in the lumen of the milk ducts, the amount of pus in secret increases.

Epizootological data. The source of the disease is sick animals. In lambs infected from sick mothers, pneumonia develops: body temperature rises to 41.5 ° C, the pulse increases, breathing becomes superficial. Appetite and chewing gum disappear, diarrhea, a wet cough, mucopurulent discharge from the nose appear. Lambs, as a rule, die, and survivors become microcarriers.

The course, symptoms and pathological changes. A sharp increase in the affected half of the mammary gland is noted (damage to both halves is rare). It is firm to the touch, the skin is tense and has a cyanotic-crimson color; subcutaneous tissue is swollen and gelatinously infiltrated. On a section the mammary gland is easily soiled, dark red; a muddy, gray-red ichorous odor mass flows from the surface of the section. Lobules of the gland are enlarged, swollen and often dark red. The interstitial tissue is thickened. The alternation of sharply hyperemic lobules with lighter areas during swelling of the interlobular connective tissue gives the cut surface a motley color that resembles a marble pattern. In advanced cases, the glandular tissue has necrotic areas with a breakdown and proliferation of connective tissue in the section.

In cases of complication of the disease with a purulent-putrefactive infection in the affected gland, encapsulated abscesses or putrefactive tissue disintegration with the involvement of the skin of the udder and the formation of external fistulas are detected. Indented lymph nodes are sharply enlarged, hyperemic, juicy, pink or red in section. The clay-colored liver, on the section is rather dry, often necrotic foci up to the size of a pea are found in it. The spleen is usually enlarged, its capsule is tense, the pulp is dark red. The kidneys are strongly hyperemic, regenerated, juicy in the section, and often have hemorrhages under the capsule.

With mastitis, gangrenous metritis and peritonitis, acute catarrh of the stomach and intestines with hemorrhages in the mucous membranes are sometimes observed. The lungs are strongly hyperemic; in most cases, they find dense, yellowish and grayish-white foci, ho from a pinhead to a pea. Lymph nodes are enlarged and hyperemic.

The diagnosis is made on the basis of epizootological data, clinical signs, pathological changes and studies of the secretion of the udder and material.

The study of sheep’s milk to identify the initial forms of the disease is carried out by express methods directly in the flock during milking.
For this purpose, samples with mastidine, dimastine or whiteatin are used, and a sedimentation test is also set.

To determine the pathogen and its resistance to antibiotics, laboratory studies of the secretion of the udder and material in the event of the death of the animal are carried out. A sample of the secretion of the mammary gland is taken sterile in test tubes. From the dead animals send pieces of the affected lobe of the udder, cut out with healthy tissue, which are placed in a 30% glycerol solution (sterile).

Treatment. Sick sheep are isolated, provide complete feeding. If the first signs of mastitis are detected, sick sheep are injected intramuscularly with penicillin 100,000-200,000 units 3 times a day and norsulfazole 1-3 g per head 2 times a day is given inside. The use of norsulfazole can be combined with intramuscular injections of erythromycin (4000-6000 units per 1 kg of animal weight 2 times a day).

Once a day, simultaneously with the intramuscular administration of an antibiotic, 50,000-100,000 IU of penicillin or streptomycin dissolved in 10 ml of saline, or oil-based bactericidal emulsions (masticide, mastisan A, B or E) are injected into the affected portion of the udder after secretion is secreted. ) To dilute the exudate of the udder, before using these preparations, a warm 1-2% solution of bicarbonate of soda is introduced through the nipple and removed. Depending on the clinical condition of the sick animal, treatment is continued for 3-4 days.

In livestock breeding for the treatment of sick sheep, it is more convenient to use drugs that have a prolonged effect. With abscesses and gangrene, the udder is cut, pus or dead tissue is removed, the cavity is irrigated with a disinfectant solution (rivanol 1: 1000-3000, 3% hydrogen peroxide, 1% lysol, etc.). Then antibiotics and sulfonamides are administered in the doses indicated above.

Prevention Ill sheep acquire immunity and do not get sick again. Uterine flocks are formed only by a livestock that is safe for infectious mastitis. Lactating queens are provided with complete feeding and create proper conditions for keeping. Systematically inspect animals, paying attention to the condition of the mammary gland.

Control measures. In dysfunctional farms, the broodstock immediately after lambing is administered intramuscularly with antibiotics of prolonged action, the injections are repeated at a monthly interval of 2-3 times (before weaning). After isolating patients, the room must be cleaned and disinfected. For disinfection, conventional disinfectants are used.
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Sheep Infectious Mastitis

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