Abstract
This chapter explains that the vitamin requirements of the growing chick shows that the needs for vitamins A and D, riboflavin and pantothenic acid, and perhaps folic acid have been investigated under sufficiently various conditions so that the range of values determined should be adequate for conditions likely to be encountered in the use of the chick as a laboratory animal. Further study of the causes of the apparent variations in requirement for vitamin A and pantothenic acid is desirable. Requirements for thiamine, niacin, pyridoxin, biotin, vitamin K, and choline can be provisionally established on the basis of present information. Some laboratory diets contain quantities of certain vitamins, greatly exceeding the requirements. There is evidence that in some cases results may be influenced in an unexpected manner by a large excess of one or more nutrients.
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