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Effect of Feeding a Milk Fat Depressing Ration on Fatty Acid Composition of Blood Lipids

Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

The feeding of high-concentrate, low-fiber rations to lactating dairy cows not only causes a drastic reduction in milk fat output, but causes major changes in the fatty acid composition of the milk fat. One of the most significant changes is a reduction in the stearic acid content of milk fat, with a concomitant increase in the unsaturated fatty acids, particularly oleic and linoleic (1). Since these acids are derived primarily from blood lipids, it was of interest to know if the fatty acid composition of blood lipids would reflect the changes seen in the milk fat, e.g., a decrease in stearic acid and an increase in the C18 unsaturated fatty acids.

Two lactating Holstein cows, equipped with rumen fistulas, were used in this study. The rations fed are given in Table 1, along with other pertinent information. The data reported represent the mean of four observations (two for each cow on each ration).