Genetic Evaluation Genetic Evaluation of Carcass Data of Carcass Data Using Age, Weight, Using Age, Weight, Fat, or Marbling Fat, or Marbling Endpoints Endpoints 2003 BIF Selection Decisions 2003 BIF Selection Decisions Committee Committee May 29, 2003 May 29, 2003 Janice M. Rumph Janice M. Rumph Montana State University – Boze Montana State University – Boze
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Genetic Evaluation of Carcass Data Using Age, Weight, Fat, or Marbling Endpoints
Genetic Evaluation of Carcass Data Using Age, Weight, Fat, or Marbling Endpoints. 2003 BIF Selection Decisions Committee May 29, 2003 Janice M. Rumph Montana State University – Bozeman. Carcass EPDs. Many breed associations are printing some form of carcass EPDs Based on an age constant - PowerPoint PPT Presentation
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Genetic Evaluation of Genetic Evaluation of Carcass Data Using Carcass Data Using Age, Weight, Fat, or Age, Weight, Fat, or Marbling EndpointsMarbling Endpoints
Montana State University – BozemanMontana State University – Bozeman
Carcass EPDsCarcass EPDs Many breed Many breed
associations are associations are printing some form of printing some form of carcass EPDscarcass EPDs Based on an age constantBased on an age constant
Few producers kill Few producers kill cattle based on an age cattle based on an age constantconstant Back FatBack Fat Carcass WeightCarcass Weight MarblingMarbling
Are we doing things Are we doing things wrong?wrong?
There is nothing There is nothing wrong with wrong with adjusting data to an adjusting data to an age-constant basis…age-constant basis…
If you are killing on If you are killing on an age-constant basisan age-constant basis
If ranking of animals If ranking of animals does not change with does not change with different endpointsdifferent endpoints
??
Initial ResearchInitial Research
Endpoints can alter expression of Endpoints can alter expression of genetic differences (Koch et al., genetic differences (Koch et al., 1995)1995)
Ranking of Simmental sires has been Ranking of Simmental sires has been shown to be differ by slaughter shown to be differ by slaughter endpoint (Shanks et al., 2001)endpoint (Shanks et al., 2001)
DataData
16,081 animals with carcass data16,081 animals with carcass data16,080 16,080 – Carcass Weight– Carcass Weight
Carcass endpoint does alter rankingCarcass endpoint does alter ranking Sometimes significantlySometimes significantly
What is the solution?What is the solution? Different EPDs for different endpoints?Different EPDs for different endpoints? Change all EPDs to a different Change all EPDs to a different
endpoint?endpoint? Do nothing?Do nothing?
Genetic Evaluation of Genetic Evaluation of Carcass Data Using Carcass Data Using Age, Weight, Fat, or Age, Weight, Fat, or Marbling EndpointsMarbling Endpoints