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    Effect of chromium and magnesium supplementation in broiler diets on body weight and some blood parameters
    (INDIAN COUNC AGRICULTURAL RES, 1999) Kalaycioglu, L; Coskun, B; Kurtoglu, F; Kurtoglu, V
    The objective of the present study was to define: the effect of supplementation of 20 mg/kg chromium (Cr) and 600 mg/kg magnesium (Mg), including two protein levels on Peterson x Avian chicks used in a 2 x 2 x 2 factorial design. The experiment lasted 51 days. Three different diets were fed between the days of 1-22, 21-35, and 35-51. Live weights and feed intake values were determined weekly At the end of the experiment blood samples were drawn by cardiac puncture. Mg and albumin levels in serum were determined by using spectrophotometer and commercial test kits. In general, there were no statistically significant effects of Cr and/or Mg supplementation in broiler diets. But in low protein groups the supplementation of the minerals increased the growth performance parameters. High protein level diets unexpectedly reduced live weight gain and feed intake but feed conversion rates in high protein groups were better than the low protein. groups. High level of protein increased serum albumin but decreased Mg levels. Mg supplementation increased serum Mg levels but not serum albumin levels while Cr supplementation did not cause any effect on levels of both parameters.
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    Effect of probiotic supplementation on laying hen diets on yield performance and serum and egg yolk cholesterol
    (TAYLOR & FRANCIS LTD, 2004) Kurtoglu, V; Kurtoglu, F; Seker, E; Coskun, B; Balevi, T; Polat, ES
    The effects of dietary supplementation of a commercial probiotic (BioPlus 2B) on daily feed consumption, egg yield, egg weight, specific gravity, body weight, feed conversion ratio, serum and egg yolk cholesterol, and serum trigylceride in layer hens were investigated. In 12 replicates, 480 27-week-old Brown-Nick layers were fed with diets containing 0, 250, 500 or 750 mg kg(-1) probiotic for 90 days. When compared with the controls, supplementation of 250, 500 and 750 mg kg(-1) probiotic increased egg production, but decreased the damaged egg ratio (p<0.05), egg yolk cholesterol and serum cholesterol (p<0.001) levels. In addition, serum triglyceride levels were reduced by using 500 and 750 mg kg(-1) probiotic supplementation (p<0.001). Feed conversion ratios were positively affected by supplementation of 250 and 500 mg kg(-1) probiotic compared with controls (p<0.05). There was no statistically significant difference between the control and all treatment groups on feed consumption, egg weight, specific gravity, body weight, and egg yolk weight.
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    Effects of dietary boron supplementation on some biochemical parameters, peripheral blood lymphocytes, splenic plasma cells and bone characteristics of broiler chicks given diets with adequate or inadequate cholecalciferol (vitamin D-3) content
    (TAYLOR & FRANCIS LTD, 2005) Kurtoglu, F; Kurtoglu, V; Celik, I; Kececi, T; Nizamlioglu, M
    1. The effects of 5 and 25 mg/kg boron supplementation of diets with inadequate (6.25 mu g/kg) or adequate (50 mu g/kg) cholecalciferol (vitamin D-3) content on some biochemical parameters, tibia characteristics, peripheral blood lymphocyte and splenic plasma cell counts of broilers were investigated. 2. Supplementation of the diet with boron affected plasma concentrations of boron, iron, copper and zinc and also tibia boron, zinc and calcium concentrations but did not have any effect on tibia iron or copper concentrations or tibia ash and tibia weight values. 3. Boron supplementation caused significant increases in splenic plasma cell count but decreased the proximal and distal tibia growth plate widths. There was no effect of boron supplementation on peripheral blood alpha-naphthyl acetate esterase (ANAE) content. Whole blood haematocrit and haemoglobin counts were significantly increased by boron supplementation but there were no effects on leucocyte ratios such as eosinophil, basophil, monocyte, lymphocyte and thrombocyte. 4. In general, the findings of the present study support the hypothesis that boron has an important biological role that affects the mineral metabolism of animals by influencing both biochemical and haematological mechanisms.
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    Egg and serum cholesterol concentrations and zootechnical performances of layer hens fed with various levels of Niacin
    (ECOLE NATIONALE VETERINAIRE TOULOUSE, 2004) Kurtoglu, F; Kurtoglu, V; Nizamlioglu, M
    In the present study. the effects of dietary supplementation of niacin on daily feed consumption, body weight, food conversion ratio, egg production, egg weight, specific gravity, serum and egg yolk cholesterol and serum triglyceride concentrations were investigated in layer hens. A total of 490 27-week-old Brown-Nick layers was divided at random into 7 groups (of 70 hens) fed with diets containing 0, 50, 100, 150, 200, 250 and 300 ppm niacin for 90 days. Niacin supplementation have resulted in decreasing egg yolk, serum cholesterol and triglyceride concentrations (P<0.001). No significant difference between the controls and all the treated groups on damaged egg ratio and body weight was obtained but egg production, food intake. feed conversion ratio. and specific gravity values were affected by niacin treatment on some periods of the experiment (P<0.05). As a conclusion, dietary niacin supplementation markedly depressed lipid metabolism and particularly cholesterol metabolism and improved some zootechnical performances without deleterious side effect. The identification of biochemical pathways affected by niacin requires further investigations.