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Ref #190 : Amino acid composition of the milk of some mammalian species changes with stage of lactation
Author(s):
Davis TA, Nguyen HV, Garcia Bravo R, Fiorotto ML, Jackson EM, Reeds PJ.
Date:
1994
Reference Type:
Journal
Periodical:
British Journal of Nutrition
Issue:
72
Volume:
6
Page range:
845 - 853
Keywords:
Acids, Alanine, Amino-acids, Colostrum, Composition, Glycine, Human-milk, Isoleucine, Lactation, Lactation-stage, Lysine, Mare-milk, Mares, Methionine, Milk, Milk-composition, Monkeys, Papio-anubis, Papio-cynocephalus, Proline, Serine, Sow-milk, Sows, Species, Women.
Abstract / Notes:
In order to determine whether the amino acid composition of milk changes during lactation, the amino acid pattern (concentration of each individual amino acid relative to the total amino acid concentration) of colostrum was compared with that of mature milk in 6 mammalian species. In the human, horse, pig and cow, the pattern of amino acids changed between colostrum and mature milk: glutamate, proline, methionine, isoleucine and lysine increased; cystine, glycine, serine, threonine and alanine decreased. In these 4 species, the total amino acid concentration also decreased 75% between colostrum and mature milk. In the baboon (Papio cynocephalus anubis and Papio cynocephalus anubis/Papio cynocephalus cynocephalus) and rhesus monkey (Macaca mulatta), however, there was little change in the pattern of amino acids between colostrum and mature milk, and total amino acid concentration decreased only approximately 25% between colostrum and mature milk. Mature milk rather than colostrum was the most similar among the 3 primates in both amino acid pattern and total amino acid concentration. It was concluded that in those species in which total amino acid concentrations decline substantially between colostrum and mature milk, amino acid patterns also change. The presence of a change in amino acid pattern and total amino acid concentration during lactation appears to be unrelated to phylogenetic order191