Turkish Journal of Veterinary & Animal Sciences
Abstract
A data set containing 2-year test day milk yield records was used. Random regression model solutions established with a covariance function (CF) approach was used. Persistence and lactation curve explanation performances of polynomial, Wilmink and Ali-Schaeffer curve definitions were compared for CF. When comparisons were made for R2 values, polynomial (0.9835) definition headed the list, followed by the Ali-Schaeffer curve (0.9534), and Wilmink curve (0.6023) definitions. Among the persistence predictions in respect of lactation orders, the Ali-Schaeffer curve provided predictions with the minimum variance, followed by the Wilmink and polynomial curve approaches. All of the curve definitions were in accord with the literature.
DOI
-
Keywords
Test-day model, covariance function, random regression
First Page
225
Last Page
231
Recommended Citation
ARSLAN, S, MİRTAGHİZADEH, H, & KESİCİ, T (2004). Genetic Parameter Estimations for Persistence of Milk Yield with Different Function Definition in Dairy Cattle. Turkish Journal of Veterinary & Animal Sciences 28 (1): 225-231. https://doi.org/-
