AN S 226 Lecture Notes - Lecture 33: Feedlot, Manganese, Bioavailability
2 May 2019
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Ans 226 feedlot minerals & vitamins: calcium, % 0. 4-0. 6, phosphorus, % 0. 3-0. 4, potassium, % 0. 6-0. 8, magnesium, % 0. 2-0. 3, sodium, % 0. 08-0. 1, sulfur, % 0. 05-0. 2, copper, ppm 6-10. Iron, ppm 50-100: manganese, ppm 20-50, zinc, ppm 50-75, cobalt, ppm 0. 1-0. 15, selenium, ppm 0. 1-0. 2. Notes on minerals: minerals needed in large amounts in the diet are termed "macro minerals. " These include: calcium, phosphorus, potassium, magnesium, sodium and sulfur. Minerals needed in small amounts are called "micro" or "trace minerals. " The micro or trace minerals of most concern are cobalt, copper, iron, iodine, manganese, selenium, and zinc. Minerals may be added to a diet individually, mixed in a: protein supplement, fed as a separate mineral mix, or a combination of the following methods, different mineral sources vary in "bioavailability. " These levels do not contribute to salt pollution: calcium and phosphorus: a calcium to phosphorus ratio of less than 1:1 or more than, 8:1 may reduce performance.
