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Requirements and Maximum Tolerable Levels of Minerals for Beef Cattle a

Requirements and Maximum Tolerable Levels of Minerals for Beef Cattle a

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

0.10

0.10

10

Copper (mg/kg)

10

10

10

100

Iodine (mg/kg)

0.50

0.50

0.50

50

Iron (mg/kg)

50

50

50

1,000

Magnesium (%)

0.10

0.12

0.20

0.40

Manganese (mg/kg)

20

40

40

1,000

Molybdenum (mg/kg)

5

Nickel (mg/kg)

50

Potassium (%)

0.60

0.60

0.70

3

Selenium (mg/kg)

0.10

0.10

0.10

2

Sodium (%)

0.06–0.08

0.06–0.08

0.10

Sulfur (%)

0.15

0.15

0.15

0.40

Zinc (mg/kg)

30

30

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.