title: Composition and variability of the branched-chain fatty acid fraction in the milk of goats and cows.
abstract: Branched-chain fatty acids of the milk fat of goats were analyzed by high resolution gas chromatography-mass spectrometry. Iso-and anteiso-acids predominated, but a range of other monomethyl-branched components, mostly with methyl-substitution on carbons 4 and 6, was present. Analysis of the milk fat of cows revealed the presence of iso-and anteiso-fatty acid; other monomethyl-substituted fatty acids, as found in the milk fat of the goat, were virtually absent. Only a trace amount of 6-methylhexadecanoate was detected. The difference between goats and cows in the effectiveness with which these animals metabolize propionyl-CoA and methylmalonyl-CoA is discussed.
mesh_terms: D000214:Acyl Coenzyme A / Q000378:metabolism; D000818:Animals; D002417:Cattle / Q000378:metabolism*; D055598:Chemical Phenomena; D002621:Chemistry; D005227:Fatty Acids / Q000032:analysis*; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D006041:Goats / Q000378:metabolism*; D008316:Malonyl Coenzyme A / Q000031:analogs & derivatives / Q000378:metabolism; D008892:Milk / Q000032:analysis*; D011422:Propionates / Q000378:metabolism
chemical_list: D000214:Acyl Coenzyme A; D005227:Fatty Acids; D011422:Propionates; C015357:methylmalonyl-coenzyme A; C009061:propionyl-coenzyme A; D008316:Malonyl Coenzyme A