Further Studies on the Growth Promoting Factor Associated with Summer Milk

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Abstract
A series of supplements was fed to rats receiving mineralized winter milk ad libitum. Growth was stimulated by daily supplements of 3 gm. fresh grass, 3 cc. grass juice, 0.6 gm. dried oat grass, 0.2 gm. rice bran, or 0.2 gm. liver extract. The known essential food factors, such as vitamins A, D, C, B, B2, B4 and B6, as well as flavin, choline, ‘goat milk factor,’ and ‘alcohol-ether precipitate factor,’ have been eliminated from consideration as being the active principles, by the inferior growth responses produced by daily doses of 2 drops of cod liver oil, 1 cc. orange juice, 0.5 gm. brewers' yeast, 0.25 gm. dried brain, and 1.0 gm. defatted wheat germ. Increased growth of rats on mineralized winter milk receiving a grass, or grass juice, supplement over that of controls receiving no supplement is accompanied by an increase in milk consumption.