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Kazova Vasfi Diren Tarım İşletmesinde Yetiştirilen Siyah Alaca Sığırlarından Elde Edilen Verilerin Farklı Laktasyon Modelleri İle Karşılaştırılması
(Comparison of Data Obtained from Holstein Cattle Bred at the Kazova Vasfi Diren Agriculture Facilities to Different Lactation Models )

Author : Yalçın TAHTALI    
Type :
Printing Year : 2019
Number : 2019-2
Page : 124-128


Summary
Bu çalışmada, Kazova Vasfi Diren Tarım İşletmesinde 2004–2009 yılları arasında yetiştirilen 176 Siyah Alaca ırkı süt sığırlarına ait 371 adet laktasyon kayıtlarından elde edilen laktasyon eğrisinin üç farklı model (Wood, Cobby and Le Du ve Wilmink) ile parametre tahminleri yapılmış ve eğri tipleri belirlenmiştir. Bu amaçla en iyi modeli belirlemek için belirtme katsayısı (R2) değerleri ve Hata Kareler Ortalaması (HKO) kullanılmıştır. Wood modeli için en yüksek belirtme katsayısı, 0,95 olarak 5. laktasyonda bulunmuştur, hata kareler ortalaması ise 35,98 olarak elde edilmiştir. Cobby and Le Du modeli için belirtme katsayısı en yüksek 4. ve 5.Laktasyonlarda 0,95 olarak bulunmuştur. Hata kareler ortalamaları ise aynı laktasyonlarda sırasıyla 57,76 ve 35,90 olarak bulunmuştur. Wilmink modeli için en yüksek belirtme katsayısı ve en düşük hata kareler ortalaması 5.laktasyonda sırasıyla 0,32 ve 37,29 olarak bulunmuştur. Yapılan çalışmada, Kazova Vasfi Diren Tarım İşletmesinde bulunan Siyah Alaca ırkı ineklerin laktasyon eğrisi tahmininde minimum HKO ve Maksimum R2’ye sahip Cobby and Le Du ve Wood modellerinin en iyi model olduğu tespit edilmiştir.

Turkish Keywords
Cobby and Le du, Laktasyon eğrisi, Siyah Alaca, Wilmink, Wood

Abstract
This study carried out parameter estimations of the lactation curve of 371 lactation records that were obtained from 176 Holstein cattle that were bred in the period of 2004-2009 at the Kazova Vasfi Diren Agriculture Facilities using three different models (Wood, Cobby and Le Du and Wilmink). For this purpose, coefficient of determination (R2) and mean squared error (MSE) values were used to determine the best model. The highest coefficient of determination for the Wood model was found as 0.95 in the 5th lactation, while the mean squared error was found as 35.98. For the Cobby and Le Du model, the highest coefficient of determination value was found as 0.95 in the 4th and 5th lactations. For these periods, the mean squared error values were 57.76 and 35.90, respectively. For the Wilmink model, the highest coefficient of determination and the lowest mean squared error value were found as 0.35 and 37.29 respectively. In the study, it was determined that the Cobby and Le Du and Wood models with the minimum MSE and maximum R2 were the best models for estimating lactation curves for Holstein cattle at the Kazova Vasfi Diren Agriculture Facilities.

Keywords
Cobby and Le du, Holstein, Lactation curve, Wilmink, Wood

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