SEVERAL workers (Lorenz, 1944, 1945; Sykes et al., 1945; Gassner and Wilgus, 1948; Bird, 1946; and Herbert and Brunson, 1957) have reported increased fat deposition in cockerels, broilers and turkeys treated with diethylstilbestrol. Reinis et al. (1962) and Malinow et al. (1963) found that diethylstilbestrol greatly elevated serum total lipid, phospholipid and cholesterol contents of cocks and cockerels.Dietary corn oil increased the liver linoleate content and decreased the palmitoleic and oleic acid contents (Marion and Edwards, 1963). Hill (1966) reported that liver trienoic acid content was high when the diet was low in linoleic acid. Trienoic acid content decreased and dienoic and tetraenoic acid contents increased with an increase in dietary linoleate.Previous investigations in our laboratory have shown that plasma oleic acid content of cockerels treated with cholesterol, diethylstilbestrol, and a combination of cholesterol and diethylstilbestrol, increased but the plasma eicosatrienoic acid content was unchanged (Chung et al., .