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Articles by Mehmet Gul
Total Records ( 2 ) for Mehmet Gul
  Mehmet GUL , M. Akif YORUK , Taylan AKSU , Adem KAYA and Ozgur KAYNAR
  The effects of different levels of canola oil (0.0, 2.0, 4.0 and 6.0%) on the performance, egg shell quality and fatty acid composition of laying hens were investigated in the present study. A total of 96 chickens consisting of 24 chickens in each group were used in the four groups. Feed and water were offered as ad libitum. Egg production was recorded daily, while feed intake was recorded weekly. Egg quality criteria were determined in 12 eggs from each group. The egg yolk fatty acid profile was determined with gas chromatography. The use of increasing levels of canola oil decreased egg production, egg weight and daily feed intake (in group including 6.0% canola oil, 70.98%, 61.68g, 109.52g respectively), although these mentioned parameters increased in the control group according to the other canola oil groups and conversely did not affect the feed conversion. In addition, supplementation of canola oil increased the yellow colour of the eggs and the egg-yellow index. On days 21 TBARS (Thiobarbituric Acid Reactive Substance) value significantly increased depending on increasing levels of canola oil (13.60, 14.78, 16.68, respectively), while on days 42 TBARS value did not change. The egg yolk lipid profile was not significantly difference in the canola oil groups, conversely decreased a very small amount of in the control group. The blood serum lipid profile decreased in the canola oil groups according to the control group. In the same time, monoaçildigliserol also decreased in the canola additive groups. In parallel with increasing levels of canola oil (42.94, 42.14 and 43.51%, respectively), monounsaturated fatty acid (oleic acid) in the egg yolks significantly increased compared to the control group (36.05%). On the basis of the results, we concluded that canola oil supplementation into the diet of laying hens is important in producing monounsaturated fatty acid (MUFA)-rich functional eggs.
  Hatice Kaya , Adem Kaya , Mehmet Gul and Saban Celebi
  This study was conducted to investigate the effect of zeolite, organic acid mixture and the combination of zeolite and organic acid mixture supplementation in a layer diet on performance, egg quality traits and some blood parameters. The experiment was carried out with a total of 96 Lohman White commercial hens 44 weeks of age in 6 replicate cages with each cage containing 4 hens who were allocated randomly to one of four dietary treatments. The hens were fed a basal diet (C), a basal diet plus 20 g kg-1 zeolite (Z), a basal diet plus 2 g kg-1 organic acid mixture (consisting of 70% propionic acid, 5% citric acid and 25% soft acid) (OA) and a basal diet plus 20 g kg-1 Zeolite and 2 g kg-1 Organic Acid mixture (ZOA). Feed intake, egg production, egg weight, feed conversion ratio and body weight did not statistically differ amoung the groups (p>0.05). Supplementing the basal diet with OA and ZOA significantly increased eggshell strength and weight. Eggshell strength was also higher on average in hens on the ZOA diets than those receiving OA. All of the additive treatments significantly increased eggshell thickness compared with that of the control group. Dietary treatment reduced serum albumin, glucose, ALP, AST and Ca contents compared with the control group (p<0.05). But treatment did not affect serum cholesterol, total protein and p levels. It can be concluded that the addition of organic acid mixture and zeolite combinations to layer diets can be beneficial in improving egg quality traits, especially shell strength and thickness.
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