Availability to ponies of calcium and phosphorus from various supplements.

I T is generally considered that Ca or P are readily available to livestock from steamed bone meal, dicalcium phosphate, ground limestone and monosodium phosphate. The following experiment was conducted to investigate the absorption and retention of Ca and P by ponies fed diets containing these supplements. The work was undertaken since there are few data obtained from studies in which these supplements were fed to horses and since a recent suggestion has been made that horses cannot effectively use Ca and P from these sources (Reichel, 1970).