The economic advantage o f terminal beef crossing in dual purpose or dairy breeds depends on the rate of AI beef crossing, but also on the extra beef value o f crossbred over purebred calves (CUNNINGHAM, 1974). In France, AI units have set up integrated selection schemes for terminal crossing within the follow ing three beef breeds : Charolais, Limousin and Blonde d'Aquitaine. Those schemes involve 3 stages : planned matings, performance and progeny testin g. Since 1973 AI units set up in station progeny testin g providing information on carcass tra its . The bulls were tested on in tensively reared veals or on young bu lls.
The g e n e tic parameters o f growth and carcass traits have to be estimated accurately in these new conditions for choosing adequate selection c rite r ia and fo r determining the possible correlated responses.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 356–362, 1982
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