Özet: Türkiye Dam ı zl ı k S ığı r Yeti ştiricileri Merkez Birli ği tarafı ndan süt verimi esas al ı narak yürütülen ı slah program ı n ı n gere ğ i olan genetik ve fenotipik parametrelerin tahmin edilmesi amac ı yla yap ı lan bu çal ış ma, Merkez Birli ğ i veri taban ı nda bulunan Siyah Alaca ı rk ı s ığı rları n soy bilgileri ve 305-gün laktasyon süt verim kay ı tlar ı kullan ı larak gerçekleştirilmi ştir. Ara ştı rmada 9655 ba ş ineğ in 1990-2001 y ı lları n aras ı nda başlam ış ilk 3 laktasyonuna ait toplam 15910 laktasyon kayd ı kullan ı lm ıştı r. Akrabal ı k matrisini olu şturmada kullan ı lan soy dosyas ı nda 22145 baş hayvan ve 222 genetik grup yer alm ışt ı r. Eklemeli genetik varyans, sabit çevre varyans ı , fenotipik varyans, kal ı tı m derecesi, sabit çevre varyans ı n ı n pay ı , tekrarlanma derecesi ve fenotipik varyasyon katsay ı sı s ı ras ıyla; 349636, 320903, 1574935, 0.222 ± .0288, 0.204 ± 0.0256, 0.426 ± 0.0102 ve % 21.8 olarak tahmin edilmi ştir. Gerçek ve tahmin edilen dam ı zl ı k değ erleri aras ı ndaki korelasyon katsay ı s ı olarak tan ı mlanan isabet derecesi için ortalama de ğ er % 54.8 olarak hesaplanm ıştı r.Anahtar Kelimeler: Siyah Alaca, süt verimi, kal ıt ı m derecesi, tekrarlanma derecesi Genetic and Phenotypic Parameters for 305-Day Milk Yield of Turkish Holstein PopulationAbstract: This study has been carried out to estimate the genetic and phenotypic parameters for 305-day milk yields of Turkish Holstein cattle to use in breeding program of Turkish Holstein Breeder's Association. The data set used in this study consisted of 15 910 first, second and third lactation milk records of 9655 cows calved between 1990 and 2001 years. The pedigree file used to build relationship matrix was cowered 22145 animals and 222 genetic groups. Estimates of additive-genetic variance, permanent variance, phenotypic variance, heritability, permanent variance ratio, repeatability and phenotypic coefficient of variation were 349636, 320903, 1574935, 0.222 ± 0.0288, 0.204 ± 0.0256, 0.426 ± 0.0102 and 21.8% respectively. The general accuracy of predictions defined as correlation between true and predicted breeding values was calculated as 54.8%.
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