Free Access
Volume 82, Number 2, March-April 2002
Page(s) 255 - 259

Lait 82 (2002) 255-259
DOI: 10.1051/lait:2002008

Comparative composition of total and sn-2 fatty acids in bovine and ovine milk fat

Deven H. Mistry, Edward J. Depeters and Juan F. Medrano

Department of Animal Science, University of California, Davis, One Shields Avenue, Davis, CA 95616-8521, USA

(Received 27 February 2001; accepted 11 July 2001)

Similar diets were fed to cattle and sheep to compare the total and the sn-2 fatty acid (FA) composition of milk fat. The study confirmed that substrate availability in the bovine and ovine mammary gland is a determining factor in the sn-2 FA composition. The acyltransferase that esterifies the FA at the sn-2 position is specific for FA of chain length C14 to C18 and has a reduced affinity for short chain FA in cattle and sheep.

Comparaison de la composition du lait en acides gras totaux et sn-2 chez les bovins et les ovins. L'étude a confirmé que la disponibilité du substrat dans la glande mammaire des bovins et des ovins est un facteur déterminant de la composition en acide gras en position sn-2 des matières grasses du lait. L'acyltransférase qui estérifie les acides gras à la position sn-2 agit surtout sur les acides gras de type C14 à C18, et n'a qu'une action réduite sur les acides gras à chaîne courte, chez les bovins et les ovins.

Key words: fatty acid / sn-2 / triglyceride composition / lysophosphatidic acid acyltransferase

Mots clés : acide gras / sn-2 / composition en triglycéride / lysophosphatidique acide acyltransférase

Correspondence and reprints: Juan F. Medrano Tel.: (530) 752 6786; fax: (530) 752 0175;

© INRA, EDP Sciences 2002

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