Browsing by Author "Tufan, T."

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    Comparison of Serum Biochemical Parameters in Ketotic and Healthy Siirt Colored Mohair Goats During Early Lactation to Identify Potential Biomarkers of Lactation Ketosis; Comparación De Parámetros Bioquímicos Séricos En Cabras De Mohair De Color Siirt Con Cetosis Y Sanas Durante La Lactancia Temprana Para Identificar Posibles Biomarcadores De Cetosis De Lactancia
    (Universidad del Zulia, Facultad de Ciencias Veterinarias, 2025) Irmak, M.; Turgut, A.O.; Eroğlu, M.; İRak, K.; Tufan, T.; Koca, D.; Keskin, I.H.
    This study aimed to compare serum biochemical parameters between ketotic and healthy Siirt colored mohair goats during early lactation, to diagnose subclinical lactation ketosis and identify potential biomarkers. A total of 77 female goats, aged 2 to 5 years and within 30 days postpartum, were evaluated under similar management conditions. The animals were classified into two groups based on serum β–hydroxybutyric acid levels: subclinical lactational ketosis (n = 37) and health controls (n = 40). β–hydroxybutyric acid levels were significantly elevated in the ketosis group (0.891 ± 0.0141 mmol·L-1) compared to the control group (0.595 ± 0.0159 mmol·L-1, P<0.001), confirming its diagnostic value. Other serum parameters did not show significant differences between the groups (P>0.05). On the other hand, effect size analysis revealed that glucose level decreased in does with subclinical lactational ketosis while cholesterol increased (large effect size). The study concluded that most liver and metabolic indicators remained within normal ranges, while glucose and cholesterol levels changed due to subclinical lactational ketosis. These data indicate that feeding based on pasture under extensive conditions may be insufficient to meet the energy requirements of does in lactation and emphasize the importance of early biochemical screening during lactation for effective management of metabolic disorders during early lactation stage in goats. Therefore, it is recommended the further studies to expand the knowledge of the effect of lactational ketosis on metabolic changes in goats. © 2025 Elsevier B.V., All rights reserved.
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    Effect of Management System and Dietary Yeast Autolysate on the Performance, Slaughter and Carcass Characteristics of Partridges (Alectoris Chukar)
    (South African Journal of Animal Sciences, 2018) Bolacali, M.; Kucuk, M.; Tufan, T.; Aslan, L.
    This study was conducted to determine the effects of management system (a floor housing (FH) versus a free-range housing (FRH) system) and dietary yeast autolysate (Saccharomyces cerevisiae) (1% versus 2% dietary supplement) on the performance, slaughter and carcass characteristics of partridges (Alectoris chukar). A total of 480 (240 for each management system) one-day-old male partridge chicks were randomly allocated to a control group and the two dietary groups per production system, each containing 80 chicks. Each dietary group was then divided into five replicate groups of 16 chicks. The study lasted 112 days. In terms of growth performance, partridges reared under FRH management system had a lower average daily live weight gain (ADG), a significantly higher feed intake (FI), and feed conversion ratio (FCR) compared to the control group. However, partridges fed diets with yeast autolysate had a significantly higher ADG, lower FI, and an improved FCR compared to the control group overall. The gizzard, leg, and wing percentages of the partridges reared in the FRH system were found to be significantly higher than those of partridges reared in the FH system, while the breast and abdominal fat percentages were found to be lower. Dietary supplementation with yeast autolysate significantly increased the cold carcass yield and breast percentage when compared to the control group, while wing and abdominal fat percentages were decreased. In general, best performance was observed in the dietary supplementation group of 1% yeast autolysate in terms of growth and carcass parameters. When considering the fact that partridges are gamebirds, that housing poultry in cage production systems has been prohibited in recent years and that there are positive effects associated with using yeast autolysate as a prebiotic, it is recommended that a free-range production system should be used for partridge breeding, with the addition of 1% yeast autolysate to the diet of the birds.