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Articles by Ferda Okan
Total Records ( 3 ) for Ferda Okan
  Muzaffer Denli , Kemal Celik and Ferda Okan
  A study was conducted to determine the efficacy of the antioxidant vitamin A, for reducing aflatoxicosis in Japanese quail (Coturnix coturnix Japonica) from hatch to 35 d of age. Sixty Japanese quail chicks were randomly divided into four groups, three treatments and one control. Control group was fed a basal diet while the treatment diets were supplemented with vitamin A (15,000 IU/kg feed), vitamin A (15,000 IU/kg) + low level of aflatoxin B1 (100 μg/kg) or aflatoxin B1 (100 μg/kg). The liver was swollen and a bright yellow color; microscopically fatty metamorphosis, necrotic areas and infiltration of polymorphonuclears were observed in aflatoxin B1 group and was not seen in any other groups. Compared to control, aflatoxin B1 (AFB1) reduced body weight gain (BWG) and feed conversion rate (FCR) by 9.3 and 7.6 % respectively. The addition of 15,000 IU/kg of vitamin A without aflatoxin B1 improved quail growth performance. Dietary vitamin A had affect on BWG and feed consumption (P<0.05) and reduced the toxic effects of AFB1, addition resulted less toxicity in the liver and kidney than AFB1 group. FC was found significantly important during third and fourth weeks in vitamin A and AFB1 added group (P<0.05) FCR was also better than AFB1 group. The concentration of liver function enzymes serum glutamic pyruvic transaminase (GPT), serum glutamic-oxaloacetic transaminase (GOT), alkaline phosphatase (ALP) increased when AFB1 was added to the diet, whereas the supplementation of the diet Vitamin A partially decreased this negative effects. These results demonstrate that vitamin A plays a complex role in the process of chemical aflatoxicosis and when added at 15.000 IU/kg in the diet can provide protection against the harmful effects of AFB1 for experimental period in Japanese quail.
  Tugay Ayasan , Ferda Okan and Hatice Hizli
  Threonine is considered to be the third limiting amino acid for broiler chicks fed low protein corn-soybean meal diets. Very limited information is available on the requirement of the threonine for broilers. The aim of this study was to determine the threonine requirements of broiler chickens from 22-42 days of age. Seventy five Ross 308 one-day-old male broiler chicks were divided into five dietary treatment groups of similar mean weight, comprising 15 birds each. They were fed a basal starting diet containing 23% CP, 3200 ME kcal/kg, 0.81% threonine and 1.24% lysine for first 3 weeks. Chicks were randomly assigned to five treatments involving 0.70, 0.75, 0.80, 0.85 and 0.90% of total threonine for 21 days (between 22-42 days). Results indicated that a linear response to dietary threonine for final body weight, body weight gain and threonine intake occurred in experiment but other live performance parameters were not impacted by dietary threonine. Our results suggest that the current NRC recommendation of 0.74% threonine for 3-6 week old broilers is adequate to support comparable growth performance.
  Muzaffer Denli , Ferda Okan and Kemal Celik
  The specific aim of this study was to determine the effects of the supplementation of separate probiotic (protexin), including organic acid combination, plant extracts, mineral salts (genex) and antibiotic (flavomycin) to broiler diets on performance, abdominal fat weight, abdominal fat percentage, liver weight, intestinal weight, intestinal length, intestinal pH, carcass weight, carcass yield of broiler chicks. In this study, 84 one-day old male broiler chicks were used and divided equally into 6 groups. When the control group was fed a diet without supplemented diet probiotic (0.1% protexin), organic acid (0.2% genex), probiotic + organic acid (0.1% protexin + 0.2% genex), antibiotic (0.15% flavomycin) and antibiotic + organic acid (0.15% flavomycin +0.2% genex) were added to the diets of the experimental groups respectively. The experimental period was 42 days. The results obtained in the experiment showed that the group receiving 0.15% flavomycin + 0.2% genex supplemented in the basal diet was exhibited higher body weight gain, feed intake and carcass weight and better feed efficiency respectively than the control and other groups (P<0.05). However liver weight, intestinal pH, and abdominal fat weight were not affected significantly by probiotic, antibiotic and organic acid treatments (P>0.05).
 
 
 
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