| abstract |
An amino acid composition suitable for administration to an animal and being capable of altering the milk protein yield of that animal comprising at least three (preferably four or all five) amino acids selected from the Group I essential amino acids: methionine, tyrosine, phenylalanine, histidine or tryptophan, and being in a form that when administered to the animal enables it to produce milk having an increased protein concentration. Compositions may further include four or more (preferably five or all six) amino acids selected from the Group II essential amino acids: threonine, valine, isoleucine, leucine, lysine or arginine. Preferably the composition is substantially free of non-essential amino acids,and is protected against metabolism in the gut or liver, particularly the rumen. Methods of producing milk of increased protein concentration using the compositions are also disclosed, as are products of these methods. |