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By Tilden Wayne Perry

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They settle to the bottom of the rumen and slowly dissolve, releasing cobalt and iron over many months. They have been used successfully in cobalt-deficient areas. XIV. SELENIUM The role of selenium in animal nutrition is critical. Although it is essential, it can cause toxic side effects. The toxic aspect of selenium was recognized first, and will be discussed below. A. Toxicity Selenosis, or selenium toxicity, has been recognized in farm animals for many years. The diseases known as blind staggers and alkali disease were identified as being caused by excessive intakes of selenium.

Absorbed manganese is excreted quickly via the bile and then via feces; very little manganese is excreted in the urine. Some manganese, however, is excreted in the pancreatic juice. The presence of increased levels of calcium results in decreased body levels of manganese. XII. COPPER Copper is involved in the incorporation of iron into the hemoglobin structure. Although only a limited amount of copper is found in the body, it is part of all tissues, with the largest amount in the liver, spleen, and kidneys.

III. POTASSIUM The adult bovine body contains about 1 kg of potassium; 73% is found in the muscles, 5% is in both the red blood cells and skeleton, about 3% is distributed in skin, brain, and intestines. Potassium is associated with nitrogen metabolism. When new protoplasmic tissue is formed, sufficient quantities of potassium are available to meet the intracellular needs of the newly formed cells. The irritability of the nervous system is dependent upon a balance between calcium, potassium, and sodium ions.

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