Table: Requirements and Maximum Tolerable Levels of Minerals for Beef Cattle a

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Requirements and Maximum Tolerable Levels of Minerals for Beef Cattle ^a

	Requirement
	____________________________________________________________
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.

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