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The Vitamin B and G Requirements of Lactation^*

(From the Department of Home Economics and Agricultural Experiment Station, University of Illinois, Urbana.)

In this paper experiments are recorded which were devised to study the relationship of each factor of the vitamin B complex to lactation. Albino rats were used as experimental animals. Untreated yeast at a level of five per cent of the diet was used as a source of the vitamin B complex. This is known to furnish the maintenance level of these vitamins but is not sufficient for lactation. Either autoclaved yeast as a source of vitamin G or tikitiki as a source of vitamin B was given in added quantities and observations were made as to the effects on lactation.

Following this procedure these conclusions may be drawn:

1. In order to produce successful lactation in the rat, both vitamins B and G must be present in the diet. It may be that there is a definite quantitative relationship which exists between the two vitamins.

2. Either vitamin B or G in quantities increased above and added to the maintenance level of the vitamin B complex yields more successful lactation. In view of the fact that just as successful results followed the use of autoclaved yeast, a source of vitamin G free from vitamin B, as were obtained when tikitiki, a source of vitamin B containing also vitamin G, was used in addition to the maintenance level of yeast, it seems possible that the added vitamin G is the more important for successful lactation.

Manuscript received 16 July 1930.