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Siyah Alaca Buzağılarında Doğum Ağırlığı Üzerinde Etkili Faktörlerin Belirlenmesi için Regresyon Ağacı Analizi

Regression Tree Analysis for Determination of the Effective Factors on Birth Weight in Holstein Calves

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DOI: 
http://dx.doi.org/10.13002/jafag4320
Abstract (2. Language): 
The aim of this paper was to describe the effects of calf sex, birth month and type on birth weight using Regression Tree (RT) analysis. For this purpose, 894 Holstein calves data raised in Polatlı State Farm were analyzed. The birth weight of calves averaged 38.478 ± 2.487 kg of total calves born, 95.5 % were single born. Twin born calves weights were lower (35.125 ± 1.652 kg) than single born (38.635±2.408 kg). Male calves were significantly (P<0.05) heavier than females by 1.28 kg. The mean birth weight of twin calves was 3.58 kg lower than that of single. Effects of calving month, sex of calf, birth type on birth weight were all significant (P<0.05).
Abstract (Original Language): 
Bu çalışmanın amacı regresyon ağacı (RT) analizi ile buzağı doğum ağırlığı üzerine, buzağı cinsiyeti, doğum tipi ve doğum ayının etkilerini belirlemektir. Bu amaçla, Polatlı Tarım İşletmesinde yetiştirilen 894 adet siyah alaca buzağılarına ait veriler analiz edilmiştir. Buzağılara ait ortalama doğum ağırlığı 38,478 ± 2.487 kg olarak bulunmuştur. Toplam buzağılamanın % 95.5 tek doğum şeklinde oluşmuştur. İkiz doğanların ağırlığı (35,125 ± 1.652 kg) tek doğanlardan (38,635 ± 2.408 kg) daha düşük bulunmuştur Erkek buzağılar, dişi buzağılardan 1.28 kg daha ağır ve önemli bulunmuştur (P<0.05). İkiz doğanların doğum ağırlığı ortalaması, tekiz doğanlardan 3.58 kg daha düşük bulunmuştur. Doğum ağırlığı üzerine buzağılama ayı, buzağı cinsiyeti ve doğum tipi etkileri anlamlı bulunmuştur (P<0.05).
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