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Requirement
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Mineral
Growing and Finishing
Gestation
Early Lactation
Maximum Tolerable Level
Chlorine (%)
—
Chromium (mg/kg)
1,000
Cobalt (mg/kg)
0.10
10
Copper (mg/kg)
100
Iodine (mg/kg)
0.50
50
Iron (mg/kg)
Magnesium (%)
0.12
0.20
0.40
Manganese (mg/kg)
20
40
Molybdenum (mg/kg)
5
Nickel (mg/kg)
Potassium (%)
0.60
0.70
3
Selenium (mg/kg)
2
Sodium (%)
0.06–0.08
Sulfur (%)
0.15
Zinc (mg/kg)
30
500
a Requirements for calcium and phosphorus are listed in the preceding nutrient requirement tables.
Adapted, with permission, from Nutrient Requirements of Beef Cattle, 2000, National Academy of Sciences, National Academy Press, Washington, DC.