Final answer:
Selenium deficiency in farm animals can lead to swayback disease and other symptoms like white muscle disease and exudative diathesis.
Explanation:
Swayback is a disease in farm animals caused by a deficiency in selenium in their ration. Selenium is required in small quantities, and its deficiency can lead to symptoms like white muscle disease and exudative diathesis. Se deficiency can be treated with vitamin E and Se supplements.
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