Relationship between change in trait definition and accuracy of genomic breeding value of type traits in Australian Holstein — ASN Events
  1. Schedule
  2. Concurrent 16 - Genomic prediction in practice II
  3. Relationship between change in trait definition and accuracy of genomic breeding value of type traits in Australian Holstein

Relationship between change in trait definition and accuracy of genomic breeding value of type traits in Australian Holstein (#94)

Mekonnen Haile-Mariam 1 2 , Jennie E Pryce 1 2 3 , Ben J Hayes 1 2 3
  1. Dairy Futures Cooperative Research Centre, La Trobe University, Bundoora, VIC 3083, Australia
  2. AgriBio Centre for AgriBioscience, Agriculture Victoria Research, Bundoora, VIC 3083, Australia
  3. School of Applied Systems Biology, La Trobe University, Bundoora, VIC 3083, Australia
Data on type traits of Holstein cows scored between 1990 and 2014 were analysed to examine the extent of change in trait definition and to assess if these changes affect the accuracy of direct genomic values (DGV) of validation animals. The results showed that for 10 of the 20 traits, the genetic correlation of a trait that was scored before 2007 was less than 0.9 with the same trait scored after 2006. For 7 of the 10 traits, where the low genetic correlation suggested some level of change in trait definition, accuracy of their observed DGV were also markedly lower than the expected accuracy and accuracy predicted from the deterministic formula.
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