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    EFFECT OF DIFFERENT ORGANIC AND INORGANIC SELENIUM LEVELS ON PERFORMANCE, SELENIUM CONCENTRATIONS OF SOME TISSUES, GLUTATHIONE PEROXIDASE ENZYME ACTIVITY AND MEAT QUALITY IN BROILERS
    (PAKISTAN AGRICULTURAL SCIENTISTS FORUM, 2016) Gocmen, R.; Yazgan, O.; Cufadar, Y.
    A total of 672 one-day-old male broiler chicks were randomly assigned to eight experiment groups each having four replicate under completely randomized design. The experimental diets were prepared by adding certain amounts of organic (Sel-Plex-50) and inorganic Selenium (Se) (sodium selenite) sources that provided 0, 0.15, 0.30 and 0.60 ppm Se in the basal ration. The experimental period was six weeks. The results revealed that none of the performance parameters were influenced significantly by the treatments. Plasma and liver Se concentration significantly increased with increasing Se levels in the diet. Breast and thigh Se concentration affected by the (source x level interaction). The main significant effect of Se level was on the plasma and liver glutathione peroxidase enzyme activity, which increased with increasing Se levels in the diets. The treatments did not significantly influence thigh and breast pH, hardness, color criteria (L, a, b) or cook loss parameters. Dietary Se levels and sources had a significant effect on the water holding capacity of the breast. Selenium supplementation of broiler diets at the level of 0.60 ppm had a positive effect on tissues Se concentration. Considering the quality of meat, the organic Se source (0.60 ppm) was more effective than the inorganic Se source.
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    The effect of replacing soya bean oil with glycerol in diets on performance, egg quality and egg fatty acid composition in laying hens
    (CAMBRIDGE UNIV PRESS, 2016) Cufadar, Y.; Gocmen, R.; Kanbur, G.
    The objective of this experiment was to replace soya bean oil with glycerol in laying hen diets and assess the change's effect on performance, parameters of egg quality and the egg fatty acid profile. A total of 60 44-week-old Hy-Line W36 laying hens were distributed according to a completely randomised experimental design into four treatments consisting of glycerol substitutions for soya bean oil dietary at varying inclusion levels (0%, 25%, 50% and 75%), with five replicates of three birds each. Dietary treatments had no significant effect on BW change, egg production, feed intake, feed conversion ratio, egg weight and egg mass of laying hens. The inclusion of glycerol in the diet of laying hens had no significant effect on egg specific gravity, eggshell breaking strength, eggshell weight, eggshell thickness, egg shape index, albumen index, yolk index, haugh unit, albumen pH, yolk pH and egg yolk colour values. The inclusion of glycerol in the diet of laying hens had no significant effect on palmitic, palmitoleic, stearic, oleic and linolenic acid contents of the egg yolk. The linoleic acid and polyunsaturated fatty acid contents of the egg yolk significantly decreased with the higher levels of dietary glycerol supplementation (P<0.05). The results of this study show that it is possible to replace 75% of soya bean oil (4.5% in diet) with glycerol.