Abstract
It has been amply demonstrated by Plimmer and Rosedale1, and by others in a less direct fashion, that growing chickens require vitamin B for growth and for the maintenance of health. These experiments also indicate that the optimum concentration of this vitamin in the ration is considerably greater with chickens than with rats, upon which most of the experimental work with growth vitamins has been done. However, the significance of such comparisons is dubious, since it is becoming increasingly evident2 that the so-called vitamin B may consist of two factors, generally occurring together in food materials, but not necessarily in the same proportion. It may be that the relative requirements for these two factors is different in different species ; if so, the relative concentrations of a given source of vitamin B (such as yeast) in the diet requisite for normal growth in rats and chickens cannot be interpreted with .
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