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Glucose and Fructose in the Fetal and Newborn Pig¹

Iowa Agriculture and Home Economics Experiment Station⁴, Ames

Abstract

A significant linear increase (82 to 102 mg./100 ml. of plasma) in glucose levels of newborn pigs occurred from birth to 12 hr. followed by a significant curvilinear decrease (102 to 89 mg./lOO ml. of plasma) over the following 36 hours. Fructose levels of blood were high (48 mg./lOO ml.) at birth followed by a highly significant curvilinear decrease to 4.8 mg./lOO ml. from birth to 48 hr. of age. Urinary fructose excretion over the first 48 hr. of life was considerably greater than the apparent loss of fructose from the blood over the same period.

Fructose was shown to be the principal sugar of fetal blood, while maternal blood contained only traces of fructose. Glucose levels of fetal blood were lower than those of the maternal blood. Amniotic and allantoic glucose and fructose levels were higher than those of fetal or maternal blood and varied considerably from fetus to fetus, with no apparent relationship to either fetal blood sugar levels or fetal age. Fructokinase activity of the liver, intestine and placenta were low relative to the activity of adult rat liver and showed no increase in activity with increase in fetal age.

¹ Journal Paper No. J-6096 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project No. 1512.

² Present address: University College, Dublin, Ireland.

³ Present address: Department of Animal Sciences, University of Kentucky, Lexington.

⁴ Department of Animal Science.

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