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Crossbred slaughter pigs issued from French Pietrain (FP) or German Pietrain (GP) boars and Large White x French Landrace sows were compared for fattening and carcass traits with control Large White « Poitou » (LWP) purebreds. Three or four females or castrated males were sampled per litter. A total of 91 half-FP 100 half-GP and 109 LWP pigs, fed ad libitum from 30 to 100 kg liveweight, completed the test. The 8 FP and the 9 LWP sires had been chosen among the upper 20 % of boars performance-tested in central stations, in accordance with the current French regulations for A.I. boars. The 8 GP boars had been bought in West Germany on the basis of combined on-the-farm testing. The comparison between half-FP and half-GP pigs did not reveal any significant difference, except for meat quality (1.5 percentage points in favour of half-GP pigs for the predicted technological yield of Paris ham processing). Half-FP and LWP pigs did not significantly differ in the latter trait. Though no significant difference was found in average daily gain on test, food conversion ratio was improved by .17 and .26 kg feed/kg gain in half-FP and half-GP pigs respectively, as compared to LWP pigs. This is to be related to the lower daily feed intake (about .2 kg) in half-Pietrain pigs. Regarding carcass traits, the differences found between LWP and half-Pietrain pigs favoured the latter in a highly significant manner. HalfPietrain pigs gave heavier and shorter carcasses (+ 1.7 points in killing out percentage and

Comparison of Large White pigs with crossbred pigs sired by French or German Pietrain boars in fattening and carcass traits