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This study was conducted to determine the effects of in ovo injection of T 3 hormone on performance, blood lipid profile, ascites and oxidative stability in broilers exposed to cold stress. For this purpose, fertile eggs except control group were injected with 25 ng T 3 on the 17 th day of incubation . In both groups, h alf of the chicks were reared under at standart temperatures while the other half was applied low temperature early (20 ± 1 0 C from 4 to 6 d old) and late (15 ± 1 0 C from 35 to 37 d old) ages. In ovo T 3 injection did not significantly affect broiler performance. At 21 d of age, cold stress treatment decreased body weight and feed intake but did not affect feed}, number={4}, publisher={Ege University} }