Abstract: The Beijing duck contains much fat which makes up 40% of the body weight and the content of cleavage products produced by irradiation is related to the amount of fat.In order to insure the safety of food,the 90-day feeding test was performed on weanling Wistar rats by feeding meat and fat of the frozen duck irradiated with ⁶⁰Coγ-ray of 2500 Gray,and chromosome aberration of mice and rats were analyzed. The results showed that there was no significant difference in appearance and behavior between the rats fed meat and fat of irrad- iated frozen duck and the controls;there was also no statistically significant difference in the rate of growth and development,coefficient of diet utilization,blood routine test and biochemistry,viscera w./body w.ratio and pathological examination of viscera compared with the controls;and also no statistically significant difference in the analysis of chromosome aberration of the rat bone marrow and the mice testes between the experimental group and the control group.Our study indicates that no ill-effects of the irradiated frozen duck can be found on the experimental animals.

Key words: irradiated food, toxicology, rats