Genetic parameter estimations for persistence of milk yield with different function definition in dairy cattle


Arslan S., Mirtaghizadeh H., Kesici T.

TURKISH JOURNAL OF VETERINARY & ANIMAL SCIENCES, vol.28, no.1, pp.225-231, 2004 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 28 Issue: 1
  • Publication Date: 2004
  • Title of Journal : TURKISH JOURNAL OF VETERINARY & ANIMAL SCIENCES
  • Page Numbers: pp.225-231

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 R-2 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.