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In this experiment; the effects of additions sunflower oil and/or inorganic (sodium selenite) and organic selenium (selenium-enriched yeast) to laying hen diet on performance, egg quality and egg shelf life were investigated. A total of 252 42-week-old Lohmann LSL white laying hens were randomly assigned to 6 experimental groups with 7 replications (6 chickens per repeat). Experimental pattern was created according to a factorial experiment plan designed according to 2×3 random plots. Six experiment diets were created by adding two different selenium (0.3 mg/kg) to both diets prepared with/without sunflower oil (3%). The experiment was continued for 12 weeks. Although no significant difference was observed between the groups in terms of egg production, feed consumption, feed conversion ratio, specific gravity, Haugh unit, albumen and yolk ratio in the experiment, significant differences were determined in egg weight, shape index, shell ratio, shell thickness, egg yolk color, albumen and yolk ratio (P=0.05). Egg yolk thiobarbituric acid reactive substances (TBARS) were higher (P<0.05) in group added only sunflower oil compared to other experimental groups. It was determined that selenium supplementation decreased TBARS value in groups fed a fatty diet (P<0.05). As a result; It was observed that the addition of sunflower oil and/or different sources of selenium to the laying hen diet did not affect performance and egg quality parameters in general; the addition of sunflower oil to the diet increased the egg yolk TBARS value, selenium supplementation prevented this increase and had favorable effects on egg shelf life. [ABSTRACT FROM AUTHOR]

The study was conducted to determine the effects of inorganic and organic copper, zinc and manganese supplementation at both recommended levels by NRC (1994), and at 66% and 33% proportion of those levels in laying hen rations on performance and egg quality in laying hens. In experiment, a total amount of 336 commercial laying Lohmann brown hens at 45 weeks of age was used. All hens were given a second period cage laying hens diet and study was conducted for 150 days. The mineral contents of inorganic groups were supplied using a standard inorganic mineral premix at both levels of NRC recommendations (29 mg Zn as (ZnSO4), 4 mg Cu (CuSO4) and 17 mg Mn as (MnSO4)) and 66% and 33% proportions of those levels. The mineral contents of organic groups were also supplied using an organic mineral premix (Bioplex™) at the same levels and proportions of those inorganic minerals. According to the results of the current study, it was indicated that traditional trace inorganic mineral (Cu, Zn and Mn) supplementation into laying hen diets are more than it is needed and this supplementation level can be reduced; organically complexed trace minerals (Cu, Zn, and Mn) can be used at a much lower concentration than the current recommended levels as inorganic minerals, without a negative impact on performance and egg quality in laying hens. [ABSTRACT FROM AUTHOR]