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Does the calcium or phosphorus content of common mineral mixtures conform to experimental findings?

University of Wisconsin

Abstract

Nutrition experiments from the earliest years of experimental work have proved the need for calcium in swine rations if these consisted of cereals that were balanced in respect to protein with by-products of cereals or seeds. All of these feeds, while fairly rich in phosphorus, are low in lime.

Further experiments in swine mineral feeding, especially those at the Ohio Experiment Station, have shown that 1 parts calcium for every 1 part phosphorus in the ration, was very nearly an optimum Ca:P ratio. Excellent growth and calcification of bones have been obtained in rations with a calcium content of .50 to .75 percent and a phosphorus content of .33 to .50 percent. Pigs in such experiments were kept in dry lot, having outdoor runs. Adding about 1% pound ground limestone or the combination of 1 pound limestone and 1 pound steamed bone meal to 100 pounds of a grain mixture brought about this favorable proportion as well as favorable level of these two mineral elements.