les meilleurs résultats. Une analyse des résultats obtenus en fonction de l'âge des parents permet d'estimer le progrès génétique réalisé grâce au contrôle individuel. Le chiffre obtenu est très voisin de celui que N AVEAU avait calculé sur la période 19 66-197 0. SUMMARY EFFECT OF THE PATERNAL ORIGIN ON THE GENETIC VALUE OF PERFORMANCE TESTED BOARS A study published in 1972 showed that in the performance testing stations, the observed heritability was very similar to the expected one. The

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... nt study demonstrates the effect of the origins of the boars. It appears that English animals give better results. By analyzing the results obtained according to the age of the parents it is possible to estimate the genetic progress realized by means ot performance testing. The figure obtained is very similar to that calculated by N AVEAU for the period 19 66-7 0 . VALEUR EN CROISEMENT DE VERRATS