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Articles by Tugay Ayasan
Total Records ( 3 ) for Tugay Ayasan
  Mayada Ragab Farag , Mahmoud Alagawany , Mohamed Ezzat Abd El-Hack , Muhammad Arif , Tugay Ayasan , Kuldeep Dhama , Amlan Patra and Kumaragurubaran Karthik
  Chromium (Cr) is one of the essential minerals which is required for improving productive performance in poultry due to its important functions in metabolism, growth and reduction of lipid and protein peroxidation. Under heat stress conditions, Cr plays a crucial role in poultry nutrition, production and health as well as enhances growth performance and quality of eggs in meat and egg type chickens, respectively. Supplementation of Cr may increase body weight gain, improve feed efficiency and there is also increase in carcass yield of broilers. Chromium is also a potent hypocholesteremic and antioxidant agent. The beneficial impacts of Cr have been linked with improved the metabolism and immune system. Dietary addition of Cr has promising impacts on the immune system through increasing relative weights of lymphoid organ such as thymus, spleen and bursa of Fabricius, declined heterophil/ lymphocyte (H/L) ratio, enhancing the Cell Mediated Immune (CMI) response and improving the antibody response versus the infectious diseases. Dietary supplementation of Cr may stimulate the secretion of digestive enzymes by improving the functions of liver and pancreas. Chromium present in many forms differs greatly in stability and oxidation states; therefore the added forms and concentrations should be managed well. Further, the increase in Cr dose in the diet could produce hazardous and toxic influences in chickens as well. This paper illustrates the positive and negative impacts of Cr including its physical and chemical proprieties, practical applications in poultry nutrition, production, enhancing immunity and health and a special reference to its toxic effects.
  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.
  Sibel Canogullari , Mikail Baylan and Tugay Ayasan
  In order to determine the threonine requirement of laying Japanese quails, one experiment was conducted using laying performance as parameters. In the study, a total of 40 female Japanese quails at 8 weeks of age were used. The quails were divided into four groups randomly. Experimental treatments consisted of four concentrations of total threonine using diets that ranged from 0.74-1.04% in progressive increments of 0.10%. Feed and water were supplied ad libitum and light was provided 16 h (from 8.00-24.00) each day. Laying performance was determined daily by measuring feed intake, feed conversion efficiency (feed intake/egg weight), egg production (number and weight). The experimental period lasted 9 weeks. Increasing threonine level in the diets increased feed conversion efficiency, total egg production (g/bird/63 days), egg weight (g/bird/day) and number of eggs (bird/63 days). However, there were no significant differences among the groups (p>0.05). About 1.04% threonine level in diet increased egg production 9.79% and number of eggs 9.30% compared with the basal diet (0.74% threonine). The results suggest that the current NRC recommendation of 0.74% threonine for laying quails is not adequate to support comparable laying performance.
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