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Partition of Nitrogen Intake and Excretion in Low-Birth-Weight Infants
Sharon M. Donovan, PhD, RD;
Stephanie A. Atkinson, PhD;
Robin K. Whyte, MB, FRCPC;
Bo Lönnerdal, PhD
Am J Dis Child. 1989;143(12):1485-1491.
Abstract
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• Although nitrogen balance studies have been carried out in low-birth-weight infants, few have partitioned the nitrogen into its components. In this study, 72-hour balance studies were conducted in 24 low-birth-weight infants (gestational age, 30.7±1.6 weeks; birth weight 1.36±0.25 kg) fed their mothers' milk (preterm milk) or 50% preterm milk and 50% formula. Total nitrogen, nonprotein nitrogen, and whey protein intake and excretion were measured. Total nitrogen intake (preterm milk group, 452 ± 138 mg/kg per day; preterm+formula group, 406±93 mg/kg per day), absorption (85%), and retention (71%) were not significantly different between groups. Intact and fragments of secretory IgA and lactoferrin were detected in soluble fecal extracts, and represented 25% and 9% of intake, respectively. Feeding preterm milk allows for nitrogen accretion similar to intrauterine growth rates for 5 weeks postnatally, and provides potentially functional proteins for the low-birth-weight infant.
(AJDC. 1989;143:1485-1491)
Author Affiliations
From the Department of Nutrition, University of California, Davis (Drs Donovan and Lönnerdal) and the Department of Pediatrics, McMaster University, Hamilton, Ontario (Drs Whyte and Atkinson).
Footnotes
Accepted for publication August 24, 1989.
Reprint requests to Department of Nutrition, University of California Davis, Davis, CA 95616.
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