CONSIDERABLE information has been gathered concerning the influence of dietary fat on fatty acid composition of egg yolk fat and body fat of the chicken (Cruickshank, 1934; Fisher and Leveille, 1957; Feigenbaum and Fisher, 1959; Ostwald et al., 1962; and Sell and Hodgson, 1963). However, there is only limited information available about the variation existing among chickens due to genetic differences, with regard to fatty acid composition of egg fat and adipose tissue (Edwards, 1964; and Chen et al., 1965).The objectives of this study were to determine the influence of dietary rapeseed oil and soybean oil on the fatty acid composition of egg fat and adipose tissue, and to obtain information about potential variation among strains of hens with respect to composition of egg and body fat.EXPERIMENTAL PROCEDUREThe experimental animals and conditions were as described by Kondra et al. (1968) in the preceding paper. Rapeseed oil and .