Journals / Atatürk Üniversitesi Ziraat Fakültesi Dergisi / 2022 / Cilt: 53 - Sayı: 1

Estimation of Growth Curves of Awassi Sheep by Isotonic Regression Analysis

İvesi Koyunlarının Büyüme Eğrilerinin İzotonik Regresyon Analizi ile Tahmin Edilmesi

Pages
67–70
Publication Date
2022-01-01
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

As a result, it was revealed that the percentage of predictability and goodness of fit of the models increased significantly with isotonic regression analysis, and as a result, more consistent adult weight estimations could be made.

📌 3 Key Takeaways

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Objective & Hypothesis:This study used isotonic regression analysis to classify non-linear regression models that were used to describe the growth curve in relation to different quality fit criteria.
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Key Findings & Data:As a result of different non-linear models that were used to predict the growth curves of Awassi sheep and the isotonic regression analysis applied to these models, considering the Mean Square Error and R2 values, the Von Bertalanffy model turned out to be the most appropriate model.
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Conclusion & Impact:As a result, it was revealed that the percentage of predictability and goodness of fit of the models increased significantly with isotonic regression analysis, and as a result, more consistent adult weight estimations could be made.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:İvesi · büyüme eğrileri · lineer olmayan modeller

Abstract

This study used isotonic regression analysis to classify non-linear regression models that were used to describe the growth curve in relation to different quality fit criteria. The best model selection was made by using the weight–age data obtained from Awassi sheep. Ten non-linear models measured by the fit quality determination coefficient, Akaike information criterion, Bayesian information criterion, mean quadratic estimation error, and estimated coefficient of determination were used. As a result of different non-linear models that were used to predict the growth curves of Awassi sheep and the isotonic regression analysis applied to these models, considering the Mean Square Error and R2 values, the Von Bertalanffy model turned out to be the most appropriate model. As a result, it was revealed that the percentage of predictability and goodness of fit of the models increased significantly with isotonic regression analysis, and as a result, more consistent adult weight estimations could be made.

Özet

Bu çalışmada farklı kalite uyum değerlendiricileri ile ilişkili olarak büyüme eğrisini tanımlamak için kullanılan doğrusal olmayan regresyon modellerini sınıflandırmak için izotonik regresyon analiz yöntemi kullanmıştır. İvesi ırkı koyunlarından elde edilen ağırlık-yaş verileri kullanılarak, en iyi model seçimi yapılmıştır. Uyum kalitesi belirleme katsayısı, Akaike bilgi kriteri, Bayes bilgi kriteri, ortalama ikinci dereceden tahmin hatası ve tahmin edilen belirleme katsayısı ile ölçülen on adet doğrusal olmayan model kullanılmıştır. İvesi koyunlarının büyüme eğrilerini tahmin etmek için kullanılan farklı lineer olmayan modeller ve bu modellere uygulanan izotonik regresyon analizi sonucunda MSE ve R2 değerleri dikkate alındığında Von Bertalanffy modelin en uygun model olduğu ortaya çıkmıştır. Sonuç olarak, izotonik regresyon analizi ile modellerin tahmin edilebilirlik yüzdesinin ve uyum iyiliğinin önemli ölçüde arttığı ve bunun sonucunda daha tutarlı ergin canlı ağırlık tahminlerinin yapılabileceği ortaya çıkmıştır.

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Cite This Article

YAĞANOĞLU, A. M. (2022). Estimation of Growth Curves of Awassi Sheep by Isotonic Regression Analysis. Atatürk Üniversitesi Ziraat Fakültesi Dergisi, Cilt: 53 - Sayı: 1, 67–70. https://ajindex.com/articles/384054

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References (12)

  1. Akbas, Y., Taskin, T., Demiroren, E., 1999. Comparison of several models to fit the growth curves of Kivircik and Daglic male lambs. Turkish Journal Veterinary Animal Science. 23:537–544.
  2. Barlow, R., E., 1972. Statistical inference under order restrictions: the theory and application of isotonic regression. London: J. Wiley, 388 p. Bilgin, O., C., Esenbuga, N., Macit, M., Karaoglu, M., 2004. Growth curve characteristics in Awassi and Morkaraman sheep, Part I: comparison of nonlinear functions. Wool Tech Sheep Breed. 52:1–7.
  3. Carneiro, P., L., S., Malhado, C., H., M., Junior, A., A., O., S., Silva, A., G., S., Santos, F., N., Santos, P., F., Paiva, S., R., 2007. Desenvolvimento ponderal e diversidade fenotípica entre cruza-mentos de ovinos Dorper com raças locais. Pesquisa Agropecuária Brasileira, 42:7, 991-998.
  4. Gunn, L., H., Dunson, D., B., 2005. A transformation approach for incorporating monotone or unimodal constraints. Biostatistics, New York, 3:6, 434-449.
  5. Hussian, M., Grimval, A., Burdakov, O., Sysoev, O., 2004. Monotonic regression for assessment of trends in environmental quality data. Eccomas. Jyvaskyl, 24-28.
  6. Kesbi, F., G., Notter, D., R., 2016. Sex influence on genetic expressions of early growth in Afshari lambs. Arch. Anim. Breed. 59: 9–17.
  7. Lewis, R., M., Emmans, G., C., Dingwall, W., S., Simm, G., 2002. A description of the growth of sheep and its genetic analysis. Animal Science 74: 51–62
  8. Malhado, C., H., M., Carneiro, P., L., S., Mello, P., R., A., M., 2009. Growth curves in Dorper sheep crossed with the local Brazilian breeds. Morada Nova. Rabo Largo. and Santa Inês. Small Ruminant Research, v.84, p.16-21.
  9. Mendes P., N, Muniz, J., A, Silva, F., F, Mazzini A., R., A., Silva, N., A., M., 2009. Análise da curva de crescimento difásica de fêmeas Hereford por meio da função não-linear de Gompertz. Ciência Animal Brasileira, 10:454-461.
  10. Ramsay, J., O., 1998. Estimating smooth monotone functions. Royal Statistical Society, 2:365-375.
  11. Silveira F., G, Silva, F., F., Carneiro, P., L., S., Malhado, C., H., M., Muni,z J., A., 2011. Análise de agrupamento na seleção de modelos de regressão não-lineares para curvas de crescimento de ovinos cruzados. Ciência Rural, 41:692-698.
  12. Topal, M., Macit, M., 2004. Prediction of body weight from body measurements in Morkaraman sheep. Journal of Applied Animal Research. 25:97-100.