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This study was conducted to investigate the effects of eggshells with membrane (ESM), the eggshells with membrane that had absorbed olive leaf extract (ESM+OLE) and olive leaf extract (OLE) additives on the performance, immunity, and oxidantantioxidant metabolism of Japanese quails exposed to heat stress. In the experiment, a total of 128 fifteen-day-old quails were divided into 4 groups with 4 replicates. The control group was fed with a maize-soybean based basal diet; the ESM group was fed with a basal diet supplemented with 2% ESM; the ESM+OLE group was fed with a basal diet consisting of 2% ESM and 200 ppm olive leaf extract and the OLE group was fed with a basal diet supplemented with 200 ppm olive leaf extract. At the end of the study, carcass characteristics and blood parameters were determined. The highest daily body weight gain and the lowest feed conversion ratio were observed in the OLE group (P<0.05). OLE was added into feed, MDA levels in the liver and heart decreased significantly (P<0.001), whereas, GSH-Px and SOD activities in both tissues alongside the GSH levels in the heart increased significantly (P<0.001). The ESM was found to significantly reduce liver MDA levels (P<0.001), and increase GSH-Px activity in both tissues, along with SOD activity and GSH levels in the heart (P<0.001). Consequently, the addition of ESM and OLE to the diets positively affected daily body weight gain, serum triglyceride, liver, and heart tissue MDA levels in the quails exposed to heat stress.

Nitrite and amine reactions can occur rapidly and produce nitrosamines, in-vivo. Diethylnitrosamine (DEN) and phenobarbital (PB) are readily inducing liver injury and hesperetin (HES), as a flavonoid found in citrus fruits, have the potential to compensate for their harmful effects. In this study, the therapeutic effects of HES were evaluated in DEN and PB mediated liver defect. Adult male Sprague-Dawley rats were split into 5 groups (n=10): Control, DEN, DEN+PB, HES, and DEN+PB+HES. 150 mg/kg DEN was applied intraperitoneally to DEN groups.Fifteen days after the DEN application 500ppm of PB was given in drinking water. HES were administered at 50 mg/kg dose orally for 8 weeks. Blood and liver malondialdehyde (MDA), glutathione (GSH) levels, and catalase (CAT), superoxide dismutase (SOD) activities were measured spectrophotometrically. Moreover, histologic examination of liver sections and apoptosis were determined with hematoxylin-eosin and TUNEL methods, respectively. DEN-PB application was found to increase blood and liver MDA levels and liver CAT activity, oppositely, decreased blood and liver SOD activity, GSH levels, and blood CAT activity. HES was found to have a positive impact on oxidative stress parameters by decreasing liver and blood MDA activity, increasing blood CAT and SOD activity together with liver GSH levels and SOD activity. Whereas DEN and PB application increased all histopathological findings and TUNEL positive cells, HES administration decreased these findings which might be important for the protection of liver cell structure from cell damage. These results suggest that HES administration could be an alternative therapeutic approach to liver damage.

Çalışma bütçesinin tamamı Fırat Üniversitesi Bilimsel Araştırma Projeleri Koordinasyon Birimi (FÜBAP)' nin TF. 16.06 proje no'lu kararı gereğince karşılanmıştır.