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1 Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden
Twenty-eight lactating cows were used to study the effects of different diets and different dietary regimens on the variation of cis-9,trans-11-octadecadienoic acid in milk.
Cows were divided into three groups and assigned to dietary treatments differing in the ratio of forage to concentrate. The control group was fed a diet with an average ratio of forage to concentrate of 50:50. The two trial groups were fed a trial diet either in restricted or nonrestricted amounts.
Variation of cis-9,trans-ll-octadecadienoic acid in milk was substantial (2.5 to 17.7 mg/g of fat). Cows fed restricted amounts of the trial diet, which contained a lower forage to concentrate ratio than did the control diet, exhibited, on average, the highest concentration (11.28 mg/g of fat). For cows fed for ad libitum consumption, the trial diet did not differ significantly from the control diet (6.6 vs. 5.0 mg/g of fat). The concentration of cis-9,trans-11-octadecadienoic acid and trans-ll-C18:1 was positively correlated. Therefore, conjugated linoleic acid in bovine milk, if considered to be beneficial, could be increased through a suitable dietary regimen.
Key Words: conjugated linoleic acid • milk • diet • principal component analysis
Submitted on December 14, 1994
Accepted on October 27, 1995
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