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Articles by Ozcan Cengiz
Total Records ( 2 ) for Ozcan Cengiz
  Mustafa Sari , Ahmet G. Onol , Mehmet Daskiran and Ozcan Cengiz
  An experiment was conducted to determine the effects of dietary organic acid and phytase supplementation on performance and calcium and phosphorus utilization in laying hens. Two hundred 23-wk-old Brown Nick layers were randomly allocated into 50 cages (42 x 50 cm) each containing 4 birds. Each dietary treatment had 5 replications and each replication comprised two adjacent cages. Corn-soybean meal based rations were used. Five dietary treatments were formed as followed: (1) a basal ration with no supplemental P (negative control, NC) (2750 kcal ME/kg, 17% CP, 0.34% total P, 3.8% Ca), (2) basal ration supplemented with dicalcium phosphate (1.4%) (positive control, PC), (3) basal ration supplemented with 0.035% phytase (ZY Phytase II-5, NC+P), (4) basal ration supplemented with 1.0% organic acid (Salstop SD, NC+OA) and (5) basal ration supplemented with both 0.035% phytase and 1.0% organic acid (NC+POA). Water and feed were provided for ad libitum consumption and a lighting program of 16 h light : 8 h dark was applied throughout the study. NC treatment resulted in body weights that were lower (p<0.05) than those of hens fed diets supplemented with phytase, organic acid, or both. Hens fed diets supplemented with dicalcium phosphate, phytase and organic acid and phytase had higher egg production (p<0.001) (91.3, 86.1 and 93.7% respectively) compared to hens fed either basal diet (78.5%) or basal diet with organic acid supplementation (78.6%). Additionally, the unsupplemented or organic acid supplemented diet had lower FI and higher FCR (p<0.01). Hen tibia ash and serum calcium levels were not affected by the dietary treatments whereas diets supplemented with dicalcium phosphate, phytase and phytase + organic acid had higher (p<0.01) serum inorganic phosphorus. The results of this study indicate that dietary phytase improves P utilization in corn-soybean meal based diets with no supplemental P and acidification of gastrointestinal tract may further improve this utilization.
  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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