Comparison of fitting performance of random regression models to test day milk yields in Holstein Friesians [Kil Keçisi (Capra hircus) Sütlerinden Polimeraz Zincir Reaksiyonu (PZR) ile Brucella melitensis Saptanmasi]
Küçük Resim Yok
Tarih
2009
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, random regression models with Ali-Schaeffer functions, Wilmink functions and orthogonal Legendre polynomials were compared for fitting performance to test day milk yields. Legendre polynomials with orders from two to six for additive genetic and permanent environmental effects were fitted under homogeneous error variance assumption throughout lactation. The analyzes were applied to 5918 first lactation test day milk yields of 612 Holstein Friesian cows calving from 1987 to 1993 in Dalaman, Tahirova, Sarimsakli and Türkgeldi State Farms. To compare the models, residual variances, -2LogL value, Akaike's information criterion, Bayesian information criterion and eigenvalues for additive genetic and permanent environmental random regression (co)variance matrix were used. Among 27 models, the L(6,2), L(6,5) and L(6,6) were chosen as better models.
Açıklama
Anahtar Kelimeler
Holstein Friesian, Random regression model, Test day milk yield
Kaynak
Kafkas Universitesi Veteriner Fakultesi Dergisi
WoS Q Değeri
Scopus Q Değeri
Q3
Cilt
15
Sayı
2
