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Effect of rock phosphate on the dairy cow

Moorman Manufacturing Co., Quincy, Ill.

Abstract

Conclusion: It is now possible to state that the toxic level of fluorine intake for dairy cows lies between 1.5 and 3 mg. of fluorine daily per kilogram of body weight. Various factors may possibly affect the toxicity of rock phosphate in such a way as to raise this toxic level. For example, it has been reported that access to pasture (which was not allowed in the Wisconsin experiment) decreases the toxicity of rock phosphate in swine rations. Sharpless has reported (3) that aluminum chloride fed to rats will decrease the toxicity of sodium fluoride. In rat experiments we have observed that the addition of calcium carbonate to the ration decreases the amount of fluorine deposited in the bone, which might reasonably be supposed to be a measure of fluorine toxicity.