- International Journal of Pure and Applied Sciences
- Cilt: 11 Sayı: 2
- Modeling of Native Sheep Breeds in Türkiye by Years with Nonlinear Mathematical Models
Modeling of Native Sheep Breeds in Türkiye by Years with Nonlinear Mathematical Models
Authors : Mustafa Şahin, İsmail Gök
Pages : 527-533
Doi:10.29132/ijpas.1734102
View : 99 | Download : 192
Publication Date : 2025-12-29
Article Type : Research Paper
Abstract :This research aims to model the changes over time regarding the data on the number of breeds (thousands piece) of native sheep breeds (Karaman, İvesi, Dağlıç, Kıvırcık, Sakız, Karakaya, Ramlıç, Pırlak, Pırıt, Polatlı, Karya, Asaf, Malya, Bafra, Menemen, Tahirova, Koçeri, Zom, Karakaş, Eşme, Norduz, Gökçeada, Acıpayam, Hemşin, Herik, Tuj, Karagül) published by Turkish Statistical Institute (TUIK) between 2000-2023. In the study, these data were estimated using 12 different models (Richard, Gompertz, Gamma, Orskov, McNally, Brody, Weibull, Quadratic, Wood, Wilmink, Cubic Piecewise, Cubic). The accuracy of the models was evaluated using statistical measures such as mean square error, adjusted coefficient of determination, accuracy and bias factors, Akaike information criterion, adjusted Akaike information criterion and Bayesian information criterion. The results showed that the Wilmink model provided the most appropriate prediction model by obtaining the lowest values. These findings emphasize the importance of correct model selection and it is recommended that these models be examined in more detail with longer-term data in future studiesKeywords : : Koyun Irk Sayısı, Yıllar, Modelleme, SAS.
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