Özlem GÜLLÜ, İsmayil Sefa GÜRCAN, Aytekin YAMAÇ, Doğukan ÖZEN

Investigation of effect of year and season factors on calving difficulty, using poisson regression model in Simmental x South Anatolian red crossbred cattle

Güç doğum, buzağı ölümlerinin ana nedeni olduğundan sığır endüstrisinde ekonomik olarak büyük bir sorundur. Sorunun, hayvancılık sektöründe melezleme programlarında uyumsuz ırkların kullanımı ile artması dikkat çekicidir. Bu çalışmada, poisson regresyon metodu kullanılarak ile güç doğum üzerine yıl ve mevsimin etkisi incelendi. Çalışmanın verilerini, özel bir işletmede Ocak 2010 ile Kasım 2012 tarihleri arasında üç yıl süre ile, sadece ilkine buzağılayan Simmental x Güney Anadolu kırmızısı melezi sığırlardan alınan toplam 1787 adet doğum kaydı oluşturmuştur. Verilere Poisson regresyon yöntemi uyum sağlamakla birlikte az miktarda sapma görülmüştür. Elde edilen sonuçlara göre; ki-kare testi ile 2010 yılı ile 2012 yılı ve 2011 yılı ile 2012 yılları arasında istatistiksel olarak anlamlı bir fark bulunmuştur (p

Poisson regresyon modeli kullanılarak Simmental x Güney Anadolu Kırmızısı melez sığırlarda yıl ve mevsim faktörlerinin güç doğum üzerine etkisinin incelenmesi

Dystocia is an economically important problem in the cattle industry because it is a major causes of calf mortality. This problem has received increased attention by the cattle industry because of the utilization of some of the incompetible sire breeds in crossbreeding programs. The aim of this study was to investigate the effect of year and season on cattle dystocia using poisson regression methodology. Only first-calf heifer data record, including a total of 1787 birth records over three years, from January 2010 to November 2012, of Simmental x South Anatolian crossbred from a private farm, were collected. Poisson regression model provides an adequate fit for this data, however there might be acceptable level of underdispersion. According the result of the Chi- Square tests, the differences between year 2010 and 2012, 2011 and 2012 were found statistically significant (p

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