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Articles by Bekir Hakan Koksal
Total Records ( 2 ) for Bekir Hakan Koksal
  Bekir Hakan Koksal , Pinar Sacakli and Ahmet Ergun
  The effects of feeding diets containing 15% Distillers Dried Grains with Solubles (DDGS) with or without phytase or vitamin D3 on egg production and some quality parameters were evaluated in laying hens. At 40 wks of age, 324 Lohmann Brown hens were randomly assigned to 6 treatments (two positive and two negative controls and two treatments) with 9 replicate groups of 6 hens each. The diets were formulated to be isocaloric and isonitrogenous (17% CP and 2700 kcal/kg ME, respectively). Dietary treatments consisted of two positive control which contain with or without 15% DDGS (3.5 g Available Phosphorus (AP)/kg and 3.58 g Ca/kg diet) in diets; two negative control which contain with/without 15% DDGS (1.9 g AP/kg and 3.33 g Ca/kg diet) in diets; negative control diet containing 15% DDGS supplemented with 300 FTU phytase/kg diet or phytase + 0.06% vitamin D3, respectively. At the end of the experiment period, dietary treatments did not significantly affect egg production, feed intake, feed efficiency and some egg quality parameters. However, hens fed with 15% DDGS consumed significantly higher yolk color then other treatment groups (p<0.001). As a result, 15% DDGS addition had no adverse effects on performance and egg quality parameters in laying hens.
  Ozcan Cengiz , Bekir Hakan Koksal , Orcun Yagin , Asli Sultan Bakirci , Devrim Beyaz , Sadik Buyukyoruk and Ahmet Gokhan Onol
  A trial was conducted to investigate the effects of a dietary prebiotic for a period of 14 d on the intestinal microflora, Dry Matter (DM) and Organic Matter (OM) digestibility and growth performance of male broiler chicks Delayed to Feed Access (DFA) after hatch. One hundred forty four 1-d-old broiler chicks (ROSS 308) were randomly distributed into 6 groups with 8 replicate pens having 3 birds in each. A 2 x 3 factorial design was implemented. Six experimental groups were formed by two levels of dietary prebiotic supplementation (Control and Agrimos®, 1 kg/ton) and three periods of DFA (0-, 24- and 48- h). Depending on the time interval between arrival to the experimental site and feeding, holding chicks prior to free access to water and feed had a negative impact (p<0.001) on the body weight. At the end of the trial, these differences remained significant for body weight (p<0.05) and feed consumption (p<0.001) of chicks with DFA. DM digestibility reduced significantly (p<0.05) in birds exposed to 24- and 48-hour delay prior to feeding. A significant decrease (6.2 vs. 5.5 log10cfu/g) in Enterobacteriaceae (p<0.01) and increase (5.5 vs. 5.9 log10cfu/g) in Lactobacilli count was noted in prebiotic supplemented groups on d 7. Dietary prebiotic supplementation improved DM (p<0.05) and OM (p<0.05) digestibility significantly. Relative weight of intestine was reduced (p<0.05) in birds fasted for 24- and 48-h after hatch. Overall, dietary prebiotic supplementation helped broiler chicks to develop a healthier intestinal microflora and this may, in turn, inhibit the DFA resulted decrease of dry matter digestibility in early growing period. However, prebiotic inclusion to broiler diets may not be a protective management practice in preventing DFA-related growth depression of broiler chickens.
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