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Am J Physiol Regul Integr Comp Physiol 278: R179-R184, 2000;
0363-6119/00 $5.00
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Vol. 278, Issue 1, R179-R184, January 2000

Identification of the conjugated linoleic acid isomer that inhibits milk fat synthesis

Lance H. Baumgard1, Benjamin A. Corl1, Debra A. Dwyer1, A. Saebø2, and Dale E. Bauman1

1 Department of Animal Science, Cornell University, Ithaca, New York 14853; and 2 Natural Lipids, N-6160 Hovdebygda, Norway

Conjugated linoleic acids (CLA) are octadecadienoic fatty acids that have profound effects on lipid metabolism. Our previous work showed that CLA (mixture of isomers) markedly reduced milk fat synthesis. In this study, our objective was to evaluate the effects of specific CLA isomers. Multiparous Holstein cows were used in a 3 × 3 Latin square design, and treatments were 4-day abomasal infusions of 1) skim milk (control), 2) 9,11 CLA supplement, and 3) 10,12 CLA supplement. CLA supplements provided 10 g/day of the specific CLA isomer (cis-9,trans-11 or trans-10,cis-12). Treatments had no effect on intake, milk yield, or milk protein yield. Only the 10,12 CLA supplement affected milk fat, causing a 42 and 44% reduction in milk fat percentage and yield, respectively. Milk fat composition revealed that de novo synthesized fatty acids were extensively reduced. Increases in ratios of C14:0 to C14:1 and C18:0 to C18:1 indicated the 10,12 CLA supplement also altered Delta 9-desaturase. Treatments had minimal effects on plasma concentrations of glucose, nonesterified fatty acids, insulin, or insulin-like growth factor-I. Overall, results demonstrate that trans-10,cis-12 CLA is the isomer responsible for inhibition of milk fat synthesis.

lactation; fatty acids; ruminants


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