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    Effects of oregano essential oil (Origanum syriacum L.) on performance, egg quality, intestinal morphology and oxidative stress in laying hens
    (Eugen Ulmer Gmbh Co, 2019) Gul, M.; Yilmaz, E.; Yildirim, B. A.; Sezmis, G.; Kaya, A.; Timurkaan, S.; Onel, S. E.
    This study aimed to investigate the effects that including different levels of oregano essential oil (Origanum syriacum L.) (200, 400, and 600 mg/kg) in the diets of laying hens had on performance, egg quality, and intestinal morphology, as well as egg malondialdehyde (MDA) levels, blood lipid peroxidation, and oxidative stress parameters. The study used a total of 120 Lohmann white laying hens aged 20 to 22 weeks. The experiment comprised the following three treatment groups, based on the dosages of oregano essential oil: 200 mg/kg (A), 400 mg/kg (B), 600 mg/kg (C); and a control group (K) that did not use oregano essential oil. Each group included 30 hens and each was divided into six subgroups with five hens each. In this study, feed intake and egg weight were significantly higher in the treatment groups than in the control group (P=0.046; P< 0.001). There was no difference among the groups in terms of eggshell strength, egg shape index, eggshell thickness, albumin index, or yolk index. However, there was a significant difference in eggshell weight, yolk color and Haugh unit in the experimental groups (P=0.015; P=0.031; P=0.042). The MDA levels in the yolk were lowest in group A (P< 0.05). In all groups with the exception of group A, yolk and serum MDA levels increased while superoxide dismutase, glutathione peroxidase, and catalase decreased as the doses of oregano essential oil increased (P< 0.001; P< 0.001; P< 0.01; P< 0.001). There was no significant serum glutathione level. In the histological analysis of the intestine, the villus height was higher in group C than in the control group (P=0.010). Based on these results, we concluded that 200 mg/kg was the most effective dose of oregano essential oil for improving performance, egg quality, and intestinal morphology while reducing oxidative stress in laying hens.
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    TECHNICAL EFFICIENCY OF DAIRY CATTLE FARMS IN THE EASTERN MEDITERRANEAN REGION OF TURKEY BY STOCHASTIC FRONTIER ANALYSIS
    (Pakistan Agricultural Scientists Forum, 2017) Parlakay, O.; Yilmaz, H.; Gul, M.; Akkoyun, S.; Bilgili, M. E.; Vurarak, Y.; Hizli, H.
    The aim of this study was to determine the technical efficiency of dairy cattle farms in Turkey. The main material of the study consists of primary data that were gathered in 2012 from 148 dairy cattle farms in the Eastern Mediterranean Region by the face to face interview method. Data were analyzed using the Stochastic Frontier Analysis method. The effects of socio-economic variables on technical efficiency were calculated using the SFA TE Effects Model. According to research results, the average technical efficiency score was found as 79%. Positive correlation between milk production and the amount of roughage usage, and negative correlation between milk production and labor force usage were found. The socio-economic variables of education, dairy cattle experience and labor force indexes were found positive. However, only dairy cattle experience was found to be significant among these variables. According to the research results, sourcing was found to be sufficient in dairy cattle farms; whereas, efficiency was found insufficient. It is possible to get higher productivity with the same amount of input usage by managing the production process as well.