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Abstract
1- The study was applied on 450 samples of chickens; 50each of Fresh, Chilled, Frozen locally, Frozen imported and Chicken parts ( Wings- fillet –thigh - liver and gizzard ) (50 from each) ,Samples were examined for the detection of hormonal residues which proved that all examined samples were within the permissible limits.
2- Experimently,150 chicks received different doses of estradiol- 17β and diethylstilbestrol with ration and give estradiol- 17β in different doses I/M, samples were collected from tissues ( wing, breast muscles, thigh muscles, skin&fat ) and giblets (liver and gizzard) for detection of hormonal residues after 4 and 21 days from the last dose which proved the presence of such residues in all samples.
3- Effect of temperatures (boiling , roasting and freezing ) on hormonal residues of positive samples , it was proved that There is no significant variations in reduction of hormonal residues in each of breast and thigh muscles of chickens at (p < 0.05) after boiling, roasting and freezing at -20˚ C as well as a significant differences was detected in skin & fat samples at (p < 0.05) after boiling and roasting.
4- Public health importance of hormonal residues was discussed.