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Articles by Metin PETEK
Total Records ( 2 ) for Metin PETEK
  Huseyin YILDIZ , Metin PETEK , Gursel SONMEZ , İlker ARICAN and Bestami YILMAZ
  This study was conducted to determine the effects of 2 lighting programs (continuous: 24 h light:0 h dark; intermittent: 12 h daylight followed by 3 cycles of 1 h light, and then 3 h dark during the night) and 3 ascorbic acid supplementations (0, 200, and 400 mg/L added to water) on broiler performance, bone characteristics, and the incidence of tibial dyschondroplasia. One-day-old male commercial (Ross PM3) broiler chicks (600) were divided into 6 treatment groups (2 x 3) with random replicates (4 replicates per treatment). At the end of 6 weeks data revealed that the lighting program, which was one of the main factors tested, affected the feed conversion ratio and live weight gain (P < 0.05), while ascorbic acid (the other main factor) and the interactions of both factors did not significantly influence broiler performance characteristics. Length and weight of the tibiotarsus were positively affected by the use of intermittent lighting, whereas ascorbic acid had a positive effect only on the weight of the bone. Continuous lighting improved cortical thickness of the tibiotarsus (P < 0.01) and decreased the incidence of tibial dyschondroplasia insignificantly. There was not a lighting x supplemental ascorbic acid interaction for tibial dyschondroplasia. The results of the present study suggest that use of intermittent lighting and supplementation of ascorbic acid (200 mg/L) can efficiently prevent leg problems, and increase bone strength and broiler performance.
  Metin PETEK , Serdal DIKMEN and Mehmet Mustafa OGAN
  The cooling performance of a traditional (control) and two stage evaporative pad cooling system (experiment), including pad and fan with tunnel ventilation, for poultry houses and the growth performance of broilers reared in these systems was compared in a study performed during extreme summer temperatures. The experimental unit had a two stage pad cooling system, which consisted of underground tubes and a box, followed by a pad cooling system with tunnel ventilation. The control unit had a traditional evaporative cooling system, including pad and fan with tunnel ventilation. Air temperature, relative humidity, and saturation efficiency were used to determine the cooling performance of the systems. Live body weight gain, feed conversion ratio, and mortality rate were used to monitor the growth performance of broilers raised in these systems. The air temperature and relative humidity of incoming house and exhausted air in the two stage pad cooling system were found to be significantly lower than those of the traditional system (P < 0.05). The cooling efficiency or saturation efficiency in the two stage cooling system was found to be slightly greater than that of the traditional system. Body weight gain was also significantly influenced by the cooling system (P < 0.05). The results indicated that two stage pad cooling is a more efficient method to alleviate heat stress in broilers during heat stress conditions and to improve growth performance.
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