THE EFFECT OF FEEDING EXTRUDED FULLFAT SO YA ON THE COMPOSITION OF FATTY-ACIDS IN COWS MILK-FAT

The objective of the paper was to determine the composition of free fa tty acids in milk of dairy cows that received extruded fullfat soya. T hirteen fatty acids were determined. There were statistically signific ant differences (P < 0.05) in fatty acid percentages concerning capric acid C-10:0, lauric acid C-12:0, stearic acid C-18:0, and linolic aci d C-18:2 between the period without extruded fullfat soya feeding and the period of its administration (Tab. III). The feeding of extruded f ullfat soya increased the content of essential fatty acids as for lino lic acid C-18:2 and linolenic acid C-18:3 and in addition, the content of arachidic acid C-20:4 was determined (Tab. III). The content of fa tty acids in milk fat ranged from 60.63% to 63.50% and the difference between the experimental periods was statistically significant. The in dexes of fat nonsaturation (I-1) and nutritive value (I-2) were calcul ated. The indexes did not show any significant differences for the per iods of observation (Tab. IV).