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Schlemmer, I.; Reese, Sven ORCID: 0000-0002-4605-9791; Ebert, U.; Metzner, Moritz (2008): Jodmangel als Bestandsproblem in einem ökologisch geführten Milchviehbetrieb. In: Tierärztliche Praxis / G, Großtiere, Vol. 36, No. 3: pp. 179-184
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Abstract

Objective: Clarification of masses in the region near the larynx, growth retardation and increased incidence of pulmonary diseases in calves from an organic farm in Bavaria. Methods: Three calves were sent to the Clinic for Ruminants for examination. Later the farm was visited and one calf was brought to the clinic for diagnosis and treatment. Results: All calves on the farm at the age of 1 day to 6 months were emaciated and their development was retarded. Eight calves had palpable masses in the area of the larynx. Blood samples were taken from animals of differentage groups for determination of glutathione-peroxidase activity(GSH-Px), thyroxin (T-4) and selenium (Se) concentrations. The three animals admitted to the clinic showed similar signs. They were euthanized and submitted for post-mortern examination. All of them displayed masses at the ventral aspect of the neck 7-15 cm in diameter. Additionally, severe bronchopneumonia and in one case fibrinouspleuritis was diagnosed. Histological findings included hypertrophy and hyperplasia with hyperaemia of the thyroid gland (goitre). T4 levels were very low in three out of nine animals (< 0.5 mu g/l), and the GSH-Px activity of all animals was below 42 U/g Hb. Analysis of the hay, fed ad libitum, yielded an iodine concentration of 0.32 mg/kg drymatter. Mineral feed had been offered to the animals; however, it did not contain any Se or iodine. The one-day old calf with goitre, Sedeficiency and bronchopneumonia was treated in the clinic with potassiumiodide, selenium, vitamin E and antibiotics. After 4.5 months the calf had recovered and was discharged. Conclusion and clinical relevance: It was concluded that the farm had an iodine deficiency problem, with clinical signs of goitre, Se deficiency and bronchopneumonia. There areno restrictions for mineral supplements in rules governing organic farming, especially for selenium or iodine. In regions with soils deficient in iodine and selenium, special attention should be paid to the supplementation of those trace elements.