A large industrial oil market has recently developed for high erucic acid (>500 g kg ¡1 ) rape (Brassica napus L.) cultivars. This research was conducted to: (i) determine genetic eVects for Wve fatty acids, (ii) determine if maternal eVects inXuence fatty acid content of progeny, and (iii) estimate correlations among fatty acid contents in hybrid progeny. Lines with very high erucic acid content and very low erucic acid content were used to develop eight generations to estimate additive, dominance, and epistatic eVects for fatty acid content using Generation Means Analyses. Mean oleic, linoleic, linolenic, eicosenoic and erucic acid content diVered among generations and additive genetic eVects were important for control of all Wve fatty acids, contributing from 84% to 97% of the total sums of squares for each fatty acid. Epistasis was observed in the inheritance of eicosenoic acid. Maternal eVects were not detected.