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Changes in Triglyceride Fatty Acid Composition of Mammary Secretions During Involution

Department of Animal Sciences, University of Illinois, Urbana 61801

G. J. Warner and R. R. Grummer

Department of Dairy Science, University of Wisconsin, Madison 53706

ABSTRACT

Changes in fatty acid composition were determined for fat triglycerides from mammary secretions of 5 Holstein cows during the first 31 d of the nonlactating period. Proportions of short-chain (4:0 to 8:0) and medium-chain (10:0 to 14:0) fatty acids declined by about 50% during the first 3 d of involution, whereas proportions of stearic (18:0) and oleic acids (18:1) increased during the same period. Little change in proportions of those fatty acids occurred after d 3 of involution. Palmitic acid (16:0) was unchanged in proportion during involution. Fatty acid composition of mammary secretion triglycerides changed rapidly in the early nonlactating period, which may reflect a specific decline in de novo fatty acid synthesis in the involuting gland.

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