According to an embodiment of the invention, a method of altering the concentration of milk fat in milk produced by a lactating ruminant includes administering to the lactating ruminant an amount of a conjugated linoleic acid compound effective to decrease the fat content of milk produced by the lactating mammal and increase {HEAD ~ the milk content} of {TAIL ~ conjugated linoleic acid isomers} such that the conjugated linoleic acid compound is not modified in the rumen of the lactating ruminant 
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According to an embodiment of the invention , a method of altering the concentration of milk fat in milk produced by a lactating ruminant includes administering to the lactating ruminant an amount of a conjugated linoleic acid compound effective to decrease the fat content of milk produced by the lactating mammal and increase { HEAD ~ the milk content } of { TAIL ~ conjugated linoleic acid isomers } such that the conjugated linoleic acid compound is not modified in the rumen of the lactating ruminant
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