In coordination with the other papers of this session consi
deration of direct selection responses will here be restricted
to grwoth and carcass traits, while litter performance and
stress susceptibility will be covered elsewhere.
Growth and carcass traits have been the dominant breeding ob
jectives for the last 30 years in most scientific selection
experiments and in practical pig breeding programmes in coun
tries with intensive pig production. Following Danish examples
testing stations were set up in many countries, to measure
growth and carcass performance using indirect component traits
of ever increasing accuracy. Early genetic analyses revealed
fairly high additive genetic variability for such traits and
therefore they were used in selection experiments and breeding
programmes in order to achieve quick genetic improvements.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 568–577, 1982
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