Abstract
Abstract Twenty-four pregnant New Zealand Romney ewes were divided into 3 groups of 8 sheep. A group was slaughtered at 125, 135, and 143 days of gestation. The livers of the dams and of one foetus from each ewe were removed, weighed, and hepatic vitamin B12 concentrations determined. There were no significant differences in the vitamin B12 concentrations of either foetal or ewe livers between the groups slaughtered at 125, l35, or 143 days of gestation. However, the mean vitamin BJ2 concentration in foetal livers was significantly lower than that of their dams (369 v. 893 Ilg/kg fresh tissue). It was concluded that milk provides most of the vitamin B12 to the suckling lamb because foetal hepatic stores are small.
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