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    Influence of Genotype and Housing Systems on the Incidence of White Striping, Proximate Composition, and Sensory Analysis of Broiler Breast Meat
    (Aves, 2023) Ozbek, Melahat; Petek, Metin; Cetin, Ece; Cetin, Ismail
    This study was carried out to investigate the influence of genotype and housing systems on the incidence of white striping, proximate composition, and sensory analysis of broiler breast meat. In total, 10 random breast muscle samples of male broilers from each of 6 interactive groups (fast and slow-growing broilers x deep litter, fully slatted flooring and free-range housing; 2 x 3:6), slaughtered at 56 days old, were collected and analyzed in the study. The proximate composition analysis was evaluated using the AOAC Official Methods of Analysis. The occurrence of white striping was determined by examining the pectoral muscles of the broiler in the groups. A 9-point hedonic scale was used for sensory analysis of meat samples. The crude ash, crude fat content, and cooking loss values of the fast-growing broilers meat samples were found greater than slow-growing broilers' meat (p < .02, p < .001, and p < .033), while meat samples of slow-growing broiler had significantly higher crude protein and water-holding capacity values (p < .001 and p < .002). The crude fat content of free-range meat and crude protein of the meat produced from the slatted floors were significantly greater than the others (p < .001 and p < .043). The prevalence of white striping in breast meat in fast-growing broilers was significantly greater than that of slow-growing broilers. The meat produced from the slatted floor had significantly greater values for odor intensity, flavor intensity, and overall acceptability than the meat produced from free-range and deep litter housing (p < .012, p < .017, and p < .006). In conclusion, it can be said that the housing system, genotype, and genotype x housing system interactions affected the broiler's breast meat quality characteristics. All nutritional characteristics of broiler breast meat and the occurrence of white striping are significantly affected by genotype. Planning further research in commercial conditions should be more useful to see the comprehensive effects of the factors investigated in this experiment.
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    Thyme Essential Oil Supplementation in Growing Merino Lambs: Effects on Growth Performance, Blood Metabolites, and Fecal Microbiology
    (Wiley, 2025) Cetin, Ismail; Cetin, Ece; Karakci, Deniz; Ercetin, Egemen
    The study was conducted to evaluate the effect of thyme essential oil on growth performance, fecal microflora and immune system parameters in growing Merino lambs to investigate its use as safe and natural method. Thirty Merino lambs were used in 45 days in a randomized complete block design. The lambs in control group did not receive thyme essential oil, whereas each lamb in experimental groups supplemented with 250 mg thyme essential oil/d (T250) and 500 mg thyme essential oil/d (T500) throughout the study. The number of coliform bacteria was found to be the lowest in the T250 group compared to the other groups. Moreover, a significant difference was found between the control and experimental groups in the Lactobacillus (p < 0.019) and Bifidobacterium (p < 0.010) counts, and it was determined that the experimental groups contained higher numbers of beneficial bacteria than the control group. Immunoglobulin G plasma levels was highest in the 500 mg/day thyme oil group compared to the other groups. In conclusion, adding thyme essential oil with a high carvacrol content to lamb rations under stress following weaning has demonstrated that it can have antibacterial, immune-supportive, and growth-promoting properties without causing a negative effect on performance parameters.