BORON IN ANIMAL NUTRITION

Abstract

A colorimetric method for the detn. of B in biological materials is described. Analyses of milk from 22 cows showed no significant differences between breeds or periods of lactation. The B conc. of milk was increased 10-fold within 24 hrs. after feeding 13 gm. of boric acid. Normal egg whites contain 8 to 10 times more B than egg yolks. The ratio is not altered by feeding the hens B although the absolute amt. increases. When fed to rats B is eliminated with extreme rapidity, but it can pass through the placenta and also into the milk of rats. The addition of B to B-low diets did not produce improved growth in rats.