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A normal thyroid gland is difficult to distinguish from the surrounding tissues. Its enlargement, referred as goiter, most often found in newborn kids, less adult animals. Feeding errors, such incorrect iodine content ration or presence of goitrogens, may contribute its formation. The occurrence goiter also have a genetic basis. Mutation within TG gene leads abnormal synthesis thyroglobulin – protein essential and storage hormones. In Poland, common problem congenital goitre, with background, caused by an increase inbreeding herd.