Seyrani KONCAGUL, Irfan DASKIRAN, Mehmet BINGOL

Growth characteristics of indigenous Norduz female and male lambs

Bu çalışmanın amacı, Norduz koyunlarının büyümesini tanımlama bakımından büyüme modellerinin karşılaştırılması ve belirlemede kullanılan büyüme modeline göre büyüme eğrisi parametrelerinin tahmin edilmesidir. Veri seti, 93 baş erkek ve 86 baş dişi kuzuya ait doğumdan 198 günlük yaş’a kadar canlı ağırlıkları kapsamıştır. Beş farklı doğrusal olmayan model (Brody, Gompertz, Logistic, Bertalanffy and Negative exponential model) belirleme katsayısı (R2), ergin canlı ağırlık (BWA), hata standart sapması (RSD) ve gözlenen ile tahmin edilen büyüme eğrisi arasındaki korelasyon katsayısı (r) kullanılarak karşılaştırılmıştır. Norduz erkek ve dişi kuzuların büyümelerini en iyi tanımlayan modelin Logistic büyüme modeli olduğu gözlenmiştir. Erkek kuzuların dişi kuzulara göre daha hızlı geliştikleri ve ergin canlı ağırlığa daha erken yaşta ulaştıkları gözlenmiştir. Cinsiyet, Norduz kuzuların büyümelerini etkileyen en önemli faktör olarak gözlenirken, doğum tipinin kuzuların büyümesi üzerine önemli bir etki yapmadığı gözlenmiştir.

Norduz dişi ve erkek kuzuların büyüme özellikleri

The objectives of the present study were to compare the growth curve models for their ability to describe the growth of Turkish Norduz sheep, and to estimate the growth curve parameters by the selected growth model. The data were collected from 93 male lambs and 86 female lambs from birth to 198 day of age. Five different nonlinear models, Brody, Gompertz, Logistic, Bertalanffy and Negative exponential, were compared using coefficient of determination (R2), asymptotic mature weight (BWA), residual standard deviation (RSD) and coefficient of correlation (r) between the observed and estimated growth curves. The Logistic growth model was observed to be appropriate for explaining the growth of Norduz female and male lambs. Male lambs grew faster and attained larger mature weight than female lambs showing that sex is the main factor affecting the growth of Norduz lambs. Type of birth had no effect on the growth of the lambs.

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