Abstract
Ninety-two purebred Jersey fetuses from clinically normal dams derived from a variety of sources but unexposed to experimental infection, were killed between 80 and 260 days after conception and dissected to provide basic parameters of a normal population. Organs and tissues were weighed and measured and the equations for the regression of the values on fetal age evaluated. Growth followed a sigmoid curve with rapid changes in growth rate between 140 and 170 days' gestation. While a few variables increased their growth rate over the late fetal period, the majority maintained a low even rate of growth. Thyroid and cerebellum weights showed a marked reduction in growth rate at this time. Long bone length and crown-anus length were the most predictable parameters for a given gestational age.
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