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Boron in Cows' Milk¹

Dairy and Animal Science Departments, Massachusetts Agricultural Experiment Station, Amherst

ABSTRACT

Boron appears to be a natural constituent of cows' milk, the amount varying with the intake of the element in the feed. Three hundred milligrams of boron fed daily as sodium tetraborate for a period of 2 mo. to six cows increased the average amount of boron in the milk approximately 2.5 times, from 270 to 663 µg. per liter of milk. The total daily amount of boron thus secreted appeared to be rather constant for individual cows, regardless of the amount of milk produced. A consistent increase in boron content of the milk was noted from the 1st to the 2nd mo. in each half of the trial, regardless of breed, group, or treatment. No plausible explanation for this increase fits the situation as a whole. A study of partition of the boron between cream and skimmilk indicated that about one-fourth of the total amount was in the cream and three-fourths in the skimmilk.

¹ Contribution No. 1140.