Abstract
Extensive literature reviews of crossbreeding results with
pigs have been presented by GLODEK (1970) and SELLIER (1970
and 1976), summarizing most pig breeding results relevant to
this topic up to 1970. Further detailed discussions on this
subject were held in 1974 at the ZEIST-SYMPOSIUM on BREED
EVALUATION and CROSSING, where in particular DICKERSON'S
(1969, 1970, 1973) model equations, as proposed and as ad
justed according to SMITH (1964), MOAV (1966) and JAKUBEC
and FEWSON (1970) to profit equations, provided theoretical
measures of comparisons between potential crosses. This
approach was also mainly followed in the NORDIC SYMPOSIUM
on CROSSBREEDING in PIGS, held in 1975 in Copenhagen, where
new Scandinavian experiments were compared with British and
German field trial results. There SCHLOTE et al. presented
individual heterosis estimates for single crosses of 3 Euro
pean and 2 American breeds. The last EAAP-Symposium on cross
breeding was also held in Copenhagen in 1974, where a survey
of new findings from Belgium, the Netherlands and Poland to
gether with the above mentioned more recent European experi
mental results were given (GLODEK, 1974). Since then we in
Europe have concentrated on the evaluation of practical hybrid
products rather than doing further test crossing experiments,
and their results, although regularly reviewed and discussed
at annual EAAP-meetings, do not provide useful data for he
terosis estimates.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 6. Round tables, , 243–253, 1982
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