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Articles by Dogan Narinc
Total Records ( 3 ) for Dogan Narinc
  Dogan Narinc , Tulin Aksoy and Emre Karaman
  This study was carried out to estimate heritabilities of growth curve parameters, weekly body weights and genetic-phenotypic correlations among the traits of growth in Japanese quail. Body weight data taken from hatching to 6 weeks of age of approximately 500 quails of both sexes from 40 sires and 120 dams were utilized to estimate genetic parameters. Restricted maximum likelihood estimation was applied for variance-covariance structures of a multiple trait pooled (sire and dam) components model using SAS PROC MIXED and SAS/IML. Growth curves for individual quail were fitted using the Gompertz model. Mean and heritability estimates of Gompertz model parameters β0, β1, β2 were 227.57, 3.44, 0.084 and 0.42, 0.21, 0.40, respectively. Heritability estimates of weekly live weights ranged from 0.42-0.62. Means and heritabilities for weight and age at the inflection point were estimated as 83.72, 15.23 and 0.36, 0.08 g, respectively. All genetic correlations were higher than phenotypic correlations. Genetic and phenotypic correlations between the growth curve parameters were relatively high and negative with one exception. The only positive correlation was between β1 and β2. Genetic and phenotypic correlations between the parameter β0 and body weights were positive and moderate to high. The genetic and phenotypic correlation estimates of parameter β2 among weekly body weights were generally negative.
  Tulin Aksoy , Dogan Narinc , Deniz Ilaslan Curek , Alper Onenc and Nilgun Yapici
  The aim of this research was to compare fast (Ross 308) and medium-growing (Hubbard ISA Red JA) broilers for growth performance and slaughter results under indoor conditions. In total 560 chicks from Fast (FG) and Medium-Growing (MG) genotypes were housed in 16 floor pens (12 chicks m-2). Feed and water were offered ad libitum and the lighting period was 18 h day-2 after the first week. All birds were fed with starter diet (21.9% CP, 3020 kcal ME kg-1) for the first 3 weeks and then grower diet (19.5% CP, 3127 kcal ME kg-1) was used. Death, body weight and feed consumption were recorded. Chickens were slaughtered at 56 days of age. Slaughter losses, carcass, giblets, abdominal fat and carcass parts weight were determined. Sensory characteristics of whole raw carcasses were evaluated by 5 panellists with a 7-point scale. Mortality rates were compared by the Mann Whitney-U test and the others with the t-test. FGs had higher body weight gain and feed consumption than MGs during the fattening period (p<0.001). Mortality of MGs (2.78%) and FGs (2.43%) were similar. MGs showed higher head, feet + shanks, offal, giblets and fat pad percent (p<0.05). Hot carcass yields were 75.7 and 72.8% for FG and MG (p<0.001). FGs took higher values for raw carcass sensory traits as conformation, subcutaneous fatness and surface colour (p<0.05). Breast and breast meat yield were higher in FGs, however MGs showed higher means for legs, wings, neck and back percent. Taking into account the performance and slaughter results, MGs are disadvantaged compared to FGs.
  Dogan Narinc , Emre Karaman , Mehmet Ziya Firat and Tulin Aksoy
  Growth is one of the well-known features in biological creatures. The evolution of body weight during growth is of particular importance in both breeding and management. In the present study, the adequacy of 11 mathematica l functions, (Gompertz, Richards, Logistic, Bertalanffy, Brody, Negative Exponential, Morgan-Mercer Flodin and three Hyperbolastic models) used to model growth characteristics of Japanese quails were compared. For this purpose, the live-weight data obtained weekly from 499 quails were fitted to aforementioned non-linear models. The results of the analysis indicated that the Gompertz model is the most appropriate one in terms of goodness of fit criteria (R2 = 0.99998, R= 0.99997, MSE = 0.318, RM = 0.03019, RSD = 0.60868, AIC = -2.010, BIC = -2.172) followed by the Richards and H3 models. Weight and age at the inflection point for Gompertz equation were calculated as 81.70 g and 14.95th day, respectively.
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