The influence of MHS-genotypes on fattening and carcass performance traitsof purebred Pietrain pigs and PI x DL slaughter pigs at testing station

For the comparison of fattening and carcass performance traits as well as t he meat quality of different MHS-genotypes, one Pietrain group with 434 and another one of 64 PI x DL animals of both sexes were evaluated. The LSQ-me ans from an animal model showed in tendency a lower fattening performance o f the stress-susceptible genotypes. Significant differences were found for higher fat layers and fat surfaces and for lower meat surfaces and percenta ge of lean meat in NP- and NN-genotypes as compared to the PP-animals. The differences between the MHS-genotypes of the PI x DL animals were similar t o those of the Pietrain animals. Both statistical models confirmed a better meat quality already in the NP-genotypes. With respect to lower loss rates , reduction of insufficient meat qualities (PSE, DFD) and a still high prop ortion of lean meat of the NP- and NN- animals, a selection of the Pietrain race for stress-resistance should he suitable.