Turkish Journal of Veterinary & Animal Sciences

Author ORCID Identifier

SELİM ESEN 0000-0001-9270-7086

VASFİYE KADER ESEN 0000-0003-0661-7688

ORHAN KARADAĞ 0000-0001-7515-9671

CENGİZ ELMACI 0000-0003-4819-0221




To achieve sustainable lamb production, it is crucial to determine the optimal slaughter age for maximum economic efficiencyand have a comprehensive understanding of breed characteristics. This study focuses on evaluating different nonlinear models todetermine the optimal slaughter age for Karacabey Merino and Kıvırcık lambs, renowned for their early development and superiormeat quality, respectively. The dataset comprised age-related live weight data from 98 lambs, including 36 female and 15 male Kıvırcıklambs, as well as 33 female and 14 male Karacabey Merino lambs. Six models, namely, negative exponential, Brody, Gompertz, logistic,Bertalanffy, and Richards were utilized to analyze the data. The model parameters were estimated through an iterative process, andtheir goodness of fit was evaluated using various metrics. The adjusted coefficient of determination for male Kıvırcık lambs was 0.9755,while female Kıvırcık lambs exhibited a lower value of 0.8912. For Karacabey Merino lambs, males had an adjusted coefficient ofdetermination of 0.9534, while females had a slightly lower value of 0.9044. The study concluded that the Brody model provided moreaccurate predictions for the growth curve of these sheep breeds compared to the other models.


growth curve, Karacabey Merino, lamb, Kıvırcık, Nonlinear models

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Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.