Composition of the non-protein nitrogen fraction of goat whole milk powder and goat milk-based infant and follow-on formulae.
The non-protein nitrogen fraction of goat whole milk powder and of infant and follow-on formulae made from goat milk was characterized and compared with cow milk powder and formulae. Goat milk infant formula contained 10% non-protein nitrogen, expressed as a proportion of total nitrogen, compared with 7.1% for cow milk formula. Goat follow-on formula contained 9.3% and cow 7.4% non-protein nitrogen. Urea, at 30%, was quantitatively the most abundant component of the non-protein nitrogen fraction of goat milk and formulae, followed by free amino acids at 7%. Taurine, glycine and glutamic acid were the most abundant free amino acids in goat milk powders. Goat milk infant formula contained 4 mg/100 ml total nucleotide monophosphates, all derived from the goat milk itself. Goat milk has a very different profile of the non-protein nitrogen fraction to cow milk, with several constituents such as nucleotides at concentrations approaching those in human breast milk.
Prosser
Colin G
CG
AgResearch, Private Bag 3123, Hamilton, New Zealand. colin@dgc.co.nz
Mclaren
Robert D
RD
Frost
Deborah
D
Agnew
Michael
M
Lowry
Dianne J
DJ
D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002417:Cattle; D002853:Chromatography, Liquid; D005260:Female; D006041:Goats; D006801:Humans; D007225:Infant Food / Q000032:analysis* / Q000592:standards; D007231:Infant, Newborn; D007774:Lactation; D008892:Milk / Q000737:chemistry*; D008895:Milk, Human; D009520:New Zealand; D017672:Nitrogen Compounds / Q000032:analysis*; D009711:Nucleotides / Q000032:analysis; D009753:Nutritive Value; D012621:Seasons; D014508:Urea / Q000032:analysis
D000596:Amino Acids; D017672:Nitrogen Compounds; D009711:Nucleotides; D014508:Urea