The vitamin‐B 12 (Cobalamin) content of the milk of lowland and hill sheep

The vitamin‐B 12 (cobalamin) content of the milk of ewes, on pasture with supplementary feeding, declines grdually during lactation. Individual values fell within the range of 1 to 6 μg./1., with mean values at different stages of lactation generally between 2 and 3 μg./1. In lowland and hill‐farm flocks the mean values ranged from 1.3 to 5.0 μ./1., with considerable variation from one animal to another. The provision of supplementary cobalt to lowland and hill flocks had no effect on the vitamin‐B 12 content of the milk.