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The Effects of In Ovo Injection of T3 Hormone on Performance, Some Blood Characteristics and Oxidative Stability in Broilers Exposed to Cold Stress

23300

this study was conducted to determine the effects of in ovo injection of T3 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 T3 on the 17th day of incubation. In both groups, half of the chicks were reared under at standart temperatures while the other half was applied low temperature early (20±1°C from 4 to 6 d old) and late (15±1°C from 35 to 37 d old) ages. In ovo T3 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 conversion ratio. Growth depression due to cold stress might not be compensated until slaughter age. There was no a significant difference in terms of mortality and no deaths from ascites have been observed. At an early age, in ovo T3 injection increased hemotocrit value while cold stress reduced rectal temperature (P 0.05). In broilers exposed to cold stress, heart ratio significantly raised. The levels of glucose, triglyceride, cholesterol, high density lipoprotein (HDL), low density lipoprotein (LDL) and T3 were not significantly affected by in ovo T3 injection. Cold stress at an early age decreased triglyceride level and increased cholesterol, HDL and LDL concentrations (P 0.05). Cold stress at late age only significantly reduced LDL level. In ovo T3 injection and cold stress did not affect malondialdehyde (MDA) and trolox equivalent antioxidant capacity (TEAC) values. In ovo T3 and cold stress treatments did not cause oxidative damage in broilers.

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Broiler , in ovo T3 injection , cold stress , performance , oxidative stress , lipid peroxidation

The Journal Of Ege University Faculty Of Agriculture

496