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This experiment was conducted to investigate the effect of coriander oil supplementation at different levels into diets of laying hens on performance, egg quality traits, yolk thiobarbituric acid reactive substances (TBARS) values and some blood parameters. A total of 96 Lohmann white layers, 24 weeks of age, were used in this study as control and three treatment groups, each containing 24 hens. Control group (K-0) was fed with diet containing a standard commercial layer diet, other treatment groups were fed with diets containing basal diet plus 0.1% (KY-1), 0.3% (KY-2), 0.5% (KY-3) coriander oil, respectively. Experiment lasted for 12 weeks. Performance parameters such as feed intake, feed conversion rate and cracked egg rate were not affected by dietary treatments (P>0.05), but adding coriander oil into layer diets increased egg production and decreased egg weight compared with the control group (P<0.01). Dietary treatment did not affected egg quality traits (P>0.05). While coriander oil supplementation decreased serum cholesterol content, other serum parameters were not affected by dietary treatment (P>0.05). Yolk TBARS values were not differed among the treatment groups (P>0.05) during storage time (0, 7, 14 and 28 days). The storage time of eggs affected TBARS formation (P<0.01) and increased yolk TBARS values significantly in egg stored during 28 days. [ABSTRACT FROM AUTHOR]

Although Turkey is one of the world's most important countries with egg production, total production is not at its current potential. The most effective way to increase total egg production is to increase productivity. In this study, egg production efficiency of rations formed by adding humate to laying hen’s basal diet at various ratios was analyzed using Gamma and McNally models. It was determined that humate added at 0.15% into diet of laying hens gives the maximum contribution to egg production. As a result, it is suggested that further investigations in different regions on different species and breed of poultry are needed to clarify the effect of humate supplemented into diets of laying hen on the egg production. [ABSTRACT FROM AUTHOR]