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* Dexcel Ltd. Private Bag 3221, Hamilton, New Zealand
New Zealand Dairy Research Institute, Private Bag 11 029, Palmerston North, New Zealand
Department of Animal Science, Cornell University, Ithaca, NY 14853-4801
Department of Animal Science, University of Arizona, Tucson, AZ
Corresponding author:
T. R. Mackle; e-mail:
tim.mackle{at}fonterra.com.
The aim of this study was to investigate the effects of conjugated linoleic acid supplementation on the synthesis of milk fat in pasture-fed Friesian cows. In four cows, a commercial mixture containing 62.3% (wt/vol) conjugated linoleic acid was infused intraabomasally to avoid rumen fermentation and biohydrogenation. The design was a 4 x 4 Latin square in which each cow received infusions of 0, 20, 40, and 80 g/d of conjugated linoleic acid mixture for 4 d. Cows were fed freshly cut ryegrass/white clover pasture ad libitum. Milk fat concentration was decreased by 36, 43, and 62% and milk fat yield was decreased by 32, 36, and 60% by the 20, 40, and 80 g of conjugated linoleic acid/d treatments. Dry matter intake, milk protein concentration, and protein yield were unaffected by treatments; however, milk yield was increased by 11% during the 40-g conjugated linoleic acid/d treatment. The effects of conjugated linoleic acid infusion were most pronounced in reducing de novo fatty acid synthesis and desaturation. Results show that the inhibitory effect of this conjugated linoleic acid mixture on milk fat synthesis occurs in pasture-fed cows, and demonstrate the potential to dramatically alter gross milk composition. This technology could offer a management tool to manipulate milk composition and energy demands of pasture-fed cows.
Key Words: conjugated linoleic acid • fat • milk • pasture
Abbreviation key: BOH = beta-hydroxybutyrate, CLA = conjugated linoleic acid, FAME = fatty acid methyl esters, NCN = noncasein nitrogen, TN = total nitrogen, TP = true protein, UN = urea nitrogen
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