Mw. A.B. Samoré, MSc : Genetic aspects in the Italian Holstein Frisian cow population

  News
  Newsroom
  Archive
  Calendar
  2012
  2011
  2010
  2009
  2008
  2007
  2006
  2005
  2004
  2003
  2002
  2001
  2000
  1999
  News
  RSS
  Calendar
  Open days
  Courses
  Congresses and symposia
  PhD-graduations and speeches

3 Mar 2003 13:30
Unit: Wageningen University
Location: Aula (gebouw 362), Gen. Foulkesweg 1, Wageningen
Promotor: prof.dr.ir. J.A.M van Arendonk (Animal Breeding and Genetics)
Co Promotor: dr.ir. A.F. Groen, dr. A. Bagnato (University of Milan)

 The value of somatic cell count (SCC) is a good indirect measure for mastitis incidence and it can be used for genetic selection in dairy cows. The inclusion of SCC in selection criteria of Italian Holstein Friesian dairy cows was studied in the thesis with the estimation of genetic parameters and the proposal of breeding value estimations. Genetic parameters presented included heritability, obtained with different data sets and models, and genetic correlations of SCC with production, conformation and longevity traits. The heritability estimated was used in the test day repeatability model, proposed for breeding value estimation, and the genetic relationships with the other traits were considered to evaluate the inclusion of SCC in the overall selection index. Finally an udder health index, including SCC, udder depth and fore udder attachment was proposed.
Print this activity