Abstract
Good growth and bone calcification of chicks at 4–5 weeks of age has been reported recently with soft phosphate in diets containing specific calcium: phosphorus ratios and high levels of vitamin D3. (Motzok et al., 1965Motzok et al., 1967; Fritz and Roberts, 1966; McKnight and Watts, 1966). Earlier, Motzok et al. (1957) studied the utilization of soft phosphate in experiments extending to 12 weeks. A practical diet, containing 180 I. U. vitamin D3 per pound, was used. Phosphorus supplements were added to bring the total calculated inorganic phosphorus to 0.45% and requisite amounts of calcium carbonate were used to provide 1.5% calcium in all diets. At 4 weeks of age the average weight of chicks fed colloidal phosphate was significantly lower than that of chicks which received the diet supplemented with bone meal. The findings at 8 weeks were the same. At 12 weeks of age there was no significant difference .
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