Abstract
EARLIER studies conducted in this laboratory have dealt with energy, protein and vitamin requirements of ducklings (Scott and Heuser, 1951Scott and Heuser, 1952; and Scott et al., 1959); little information is available on mineral requirements. Since rickets is uncommon in commercial ducks, it appears likely that the calcium and phosphorus levels used in commercial diets are adequate. These levels usually have been set somewhat higher than the 1.0% Ca and 0.45% available P which are the recommended levels for chickens. In view of the possible detrimental effects of excessive calcium and phosphorus levels, or improper ratios of calcium to phosphorus, not only upon the occurrence of rickets but also as etiological factors in leg weaknesses, it was considered desirable to determine the calcium requirement of young ducklings. The results of four experiments on the calcium requirement, conducted during the past four years, are presented in this report.EXPERIMENTALWhite Pekin ducklings were .
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