Conjugated linoleic acid content in milk fat of the cows fed a large amount of linseed
1999
Aii, T. (National Grassland Research Inst., Nishinasuno, Tochigi (Japan)) | Tamaki, M. | Shimabukuro, H. | Hayasawa, H. | Shimizu, T. | Ishida, S.
The effect of providing a diet containing a large quantity of linoleic acid (C 18 : 2n-6) on the production of cow's milk rich in conjugated linoleic acid was examined using four lactating Holstein cows (mean milk yield : 26.8kg). One group of cows was fed with experimental diet containing linseed and the other group was fed with diet without linseed for a period of 56 days. The control and experimental cows received daily 224 g of C 18 : 2n-6/head and 308 g of C 18 : 2n-6/head, respectively. A mean cis-9, trans-11/trans-9, cis-55-octadecadienoic acid (CLA-1) content of the milk fat of the experimental cows was about 3.7 times as much as that of the control cows (18.2 +- 2.8 (X +- STD) vs. 4.9 +- 1.1 mg/g of milk fat). The rate of conversion of ingested C 18 : 2n-6 to CLA-1 of milk fat was about 20.2%. The mean CLA-1 content of the serum lipid was 0.08 +- 0.01% and 0.27 +- 0.03% of the total fatty acids for the control and the experimental cows, respectively. On the other hand, mean trans-11-octsidecenoic acid contents of the milk fat and serum lipid increased from 2.2 to 5.4% and from 0.93 to 2.48%, respectively, as a result of feeding the experimental diet
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