Six groups of broiler chickens, 18 each, were fed from the first day of life to slaughter at the age of 7 weeks on wheat-soyabean diets supplemented with fat in the amount of 34 g/kg diet. The sources of fat were: rape seed oil, soyabean oil, a mixture of rape seed and soyabean oils, full-fat seeds of a brown-seed variety of linseed, Opal, or the yellow-seed variety Linola; the control diet was not supplemented with fat. Opal linseed contained (in % of total fatty acids) 15.9 linoleic acid (C 18:2 n-6) and 72.8 α-linolenic acid (C 18:3 n-3); the seeds of the Linola variety contained, respectively, 51.5 and 1.8. After slaughter, the breast muscle and abdominal fat were taken from 5 chickens in each group. In the birds fed the diet with Opal linseeds, the PUFA n-6/n-3 ratio was 3.1 in breast muscle lipids and 1.1 in abdominal fat, whereas the same ratios in the birds fed the diet with Linola seeds was 24.3 and 23.6, while in the control birds, 28 and 15.5. Adding Linola linseeds to diets for broiler chickens cannot be recommended as a means of improving the nutritional value of broiler meat tissues.