A Decision Tree Model to Determine Some Environmental Factors Affecting 305-Day Milk Yield in Simmental Cows

Öz

In this study, some environmental factors thought to be effective on 305-day milk yield in Simmental cows, were examined according to the decision tree method with regression tree algorithm. For this purpose, the effect levels of calving interval, somatic cell count, calving age, and parity variables on the 305-day milk yield of 148 Simmental cows were determined. As a result of the decision tree application, the factors affecting 305-day milk yield were found as parity, calving age, somatic cell count, and calving interval, in order of importance. In addition, it was determined that the 305-day milk yield of the cows with the calving age above 5 was high, and the cows with the somatic cell count greater than 104.500 were found to be the lowest. There is a need to use the decision tree approach in order to examine the effects of other environmental factors that are thought to be effective on milk yield or other economic characteristics in dairy farming and to provide appropriate conditions by correcting the relevant factors accordingly.

Anahtar Kelimeler

• Decision Tree
• 305-day milk yield
• Simmental cow

Simmental İneklerde 305 Günlük Süt Verimini Etkileyen Bazı Çevresel Faktörlerin Belirlenmesine Yönelik Bir Karar Ağacı Modeli

Öz

Bu çalışmada Simmental (Sarı Alaca) ineklerde 305 günlük süt verimi üzerinde etkili olduğu düşünülen bazı çevresel faktörler regresyon ağacı algoritması ile karar ağacı yöntemine göre incelenmiştir. Bu amaçla buzağılama aralığı, somatik hücre sayısı, buzağılama yaşı ve laktasyon sırası değişkenlerinin 148 adet Simmental ırkı ineğin 305 günlük süt verimine etki düzeyleri belirlenmiştir. Karar ağacı uygulaması sonucunda 305 günlük süt verimini etkileyen faktörler önem sırasına göre laktasyon sırası, buzağılama yaşı, somatik hücre sayısı ve buzağılama aralığı olarak bulunmuştur. Ayrıca buzağılama yaşı 5 yıl yaşın üzerinde olan ineklerin 305 günlük süt veriminin yüksek olduğu, somatik hücre sayısı 104,500’ün üzerinde olan ineklerin ise en düşük olduğu belirlenmiştir. Süt hayvancılıkta süt verimi veya diğer ekonomik özellikler üzerine etkili olduğu düşünülen başka çevresel etmenlerin etkilerini incelemek ve buna göre ilgili faktörlerin düzeltilerek uygun şartların sağlanması için karar ağacı yaklaşımının kullanılmasına ihtiyaç vardır.

Anahtar Kelimeler

• Karar ağacı
• 305 Günlük süt verimi
• Simmental inek

Kaynakça

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