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Articles by Irfan Ozturk
Total Records ( 3 ) for Irfan Ozturk
  Sabri Yurtseven and Irfan Ozturk
  This study was performed to evaluate the effect of different cereal source in choice feeding systems on performance and on emission of carbon dioxide (CO2) and enteric methane (CH4) in dairy Awassi ewes. Total 16 dairy ewes were divided into two groups: the corn based free choice (CFC) group received feed ingredients separately (corn, wheat bran, soybean meal (SBM), cottonseed meal (CSM) and alfalfa hay) and the barley based free choice group (BFC) group received barley instead of corn as carbon hydrate source. The results showed no significant differences (p > 0.05) between treatments in live weight, live weight gain, milk yield, milk composition and CO2 production. However, the results of CH4 measurement indicated significant differences between groups in the amounts of CH4 produced. The ewes in the CFC group produced less CH4 than the ewes that received the BFC system (CFC: 21.82; BFC: 38.34 g/day/sheep). The results indicate that the CFC system modified ruminal fermentation and affected the Volatile Fatty Acid (VFA) components and levels in ruminal fluid. In ewes on the CFC system, the level of propionate was greatly increased (CFC: 19.77 vs. BFC: 14.53%) and the level of acetate decreased (CFC: 68.34 vs. BFC: 75.58%). Butyrate level was not changed relative to the total VFA components. There were no significant differences in ruminal pH level between treatments. The results indicate that the CFC system has a potential mitigating effect on enteric emission of CH4 but not CO2.
  Sabri Yurtseven , Mehmet Cetin , Irfan Ozturk , Abdullah Can , Mustafa Boga , Tekin Sahin and Huseyin Turkoglu
  This study was performed to evaluate the effect of different feeding systems (choice feeding and conventional system) on performance and emission of carbon dioxide (CO2) and enteric methane (CH4) in dairy Awassi ewes. One chamber was equipped with gas analyzers to measure CH4 and CO2 for 23 h day-1. In total, 16 ewes were used. The ewes were divided into two groups: the Free Choice (FC) group received feed ingredients separately and the Total Mixed Ration (TMR) group received a standard mixed concentrate: forage diet in a ratio of 60:40. The results showed no significant differences between treatments in performance parameters. However, the results of CH4 and CO2 measurement indicated significant differences between groups in the amounts of CH4 and CO2 produced per kg dry matter intake. The ewes in the FC group produced less CH4 per animal than the ewes that received the TMR system. In ewes on the FC system, the level of propionate was greatly increased relative to the total VFA components. There were no significant differences in ruminal pH and acetate level between treatments. The results indicate that the FC system may be a potential mitigating effect on enteric emission of CH4 and CO2.
  Erkan Boydak , Davut Karaaslan , Mehmet Simsek , Sinan Gercek , Halil Kirnak , Yasar Kasap and Irfan Ozturk
  The aim of this study, was to determine the effects of irrigation methods and irrigation intervals on yield, plant height, number of branches and number of capsules for 2 years period. The study had two irrigation methods (sprinkle and drip), four irrigation intervals (6, 12, 18 and 24 day intervals) and three replication in Harran Plain conditions, where is semi-arid area in Turkey. Decreasing irrigation interval increased the yield per hectare and capsules number per plant. The highest yields were obtained at 6 and 12 day intervals (173.7 and 175.3 kg ha-1, respectively) from drip irrigation methods and the lowest yields were obtained at 24 day intervals (64.1 kg ha-1) from sprinkle irrigation methods. Generally, the higher yields were obtained from narrow irrigation interval and springle irrigation methods.
 
 
 
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