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Comparison of breeding values and genetic trends for production traits estimated by a Lactation Model and a Fixed Regression Tes

  • 2006
  • Issue: 2
  • Volume: 36
B.E. Mostert, H.E. Theron, F.H.J. Kanfer and E. van Marle-Köster Page: 71 - 78

A comparison of breeding values and genetic trends of production traits from two models is made. One set of breeding values and trends was estimated by the September/October 2003 South African National Genetic Evaluation, using a Lactation Model (LM). The…

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Adjustment of heterogeneous variances and a calving year effect in test-day models for national genetic evaluation of dairy catt

  • 2006
  • Issue: 3
  • Volume: 36
B.E. Mostert, H.E. Theron, F.H.J. Kanfer and E. van Marle-Köster Page: 165 - 174

South Africa implemented test-day models for genetic evaluations of production traits, using a Fixed Regression Test-Day Model (FRTDM), which assumes equal variances of the response variable at different days in milk, the explanatory variable. Data at the beginning and at…

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