Effect of Feeding Different Combinations of Soft Phosphate with Colloidal Clay and Dicalcium Phosphate with and without Added Fluorine for Growing-Finishing Swine

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Abstract
Fifty-four crossbred pigs were fed from 75 to 200 lb. body weight to study the effects of (1) varying proportions of soft phosphate with colloidal clay (colloidal phosphate) and dicalcium phosphate as sources of supplemental phosphorus and (2) adding sodium fluoride to the ration to give a calculated fluorine content in the ration equivalent to that when colloidal phosphate supplied 100% of the supplemental phosphorus. Increasing the levels of colloidal phosphate from 0 to 4.0% of the ration (0 to 100% of the supplemental phosphorus) resulted in a statistically significant linear decrease in rate of gain and feed efficiency when no sodium fluoride was added to the rations. There was an indication of a factor or factors other than fluoride in the colloidal phosphate which contributed to the depressing effect of colloidal phosphate on gains and feed conversion.