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document
Milk protein quantity and quality in low-birth-weight infants . IV . Effects on tyrosine and phenylalanine in plasma and urine . Well , appropriate-for-gestational age , low-birth-weight infants were divided into three gestational age groups and assigned randomly within each age group to one of five feeding regimens : pooled human milk ( BM ) ; formula 1 ( F1 ) = 1.5 gm/dl protein , 60 parts bovine whey proteins : 40 parts bovine caseins ; F2 = 3.0 gm/dl , 60:40 ; F3 = 1.5 gm/dl , 18:82 ; F4 = 3.0 gm/dl , 18:82 . Plasma and urine concentrations of tyrosine and phenylalanine were far higher in the infants fed F1 to F4 , especially F2 and F4 , than in the infants fed BM . These findings offer further evidence for the limited capacity of the low-birth-weight infant to catabolize tyrosine . Infants fed F3 had significantly higher plasma tyrosine concentrations than infants fed F1 , and those fed F4 had higher concentrations than those fed F2 . Thus , increased plasma tyrosine concentrations in low-birth-weight infants are related directly both to the quantity and to the quality of the protein in their diets .
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Intervention_Pharmacological
pooled human milk
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Intervention_Pharmacological
protein
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Intervention_Pharmacological
bovine whey proteins
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Intervention_Pharmacological
bovine caseins
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Outcome_Physical
tyrosine
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Outcome_Physical
phenylalanine
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Outcome_Physical
tyrosine
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Outcome_Physical
phenylalanine
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Outcome_Physical
catabolize tyrosine
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Outcome_Physical
plasma tyrosine concentrations
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Outcome_Physical
plasma tyrosine concentrations
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Participant_Condition
low-birth-weight
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Participant_Age
infants
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Participant_Age
appropriate-for-gestational age
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Participant_Condition
low-birth-weight
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Participant_Age
infants