The availability of the phosphorus in "bone pellets" and aluminium-iron
rock phosphates was compared with bone meal.
In evaluating the products, inorganic phosphorus content of the blood, live
weight gains, phosphorus retention, X-ray photographs and the pathological and
chemical examination of the bones of the sheep were used as criteria.
From the overall results thus obtained it can be concluded that:
(i) "Bone pellets" are as efficient as bone meal as a source of phosphorus.
(ii) Aluminium-iron rock phosphate is practically useless in this respect
and cannot replace bone meal in animal nutrition.