Apa I and Cfo I polymorphisms in the fragment spanning from the first exon to the third intron of the growth-hormone gene were analysed in 77 Osterreichischen Edelschwein and 269 Osterreichischen Landrasse pigs. The interrelationships between them and the Hac II, Msp I, and ryr 1 polymorphisms were investigated. The differences in distribution between the two breeds were significant at all loci (p < 0.05 to p < 0.01). It is concluded that the Apa I, Cfo I, Hae II, and Msp I pGH polymorphisms analysed can be used as genetic markers for the breeds. The interactions between the analysed polymorphic systems vary considerably. The strongest interaction was found between Cfo I and Hae II in both breeds (C=0.85). This might be a result of similarity in their restriction enzyme sites. No interactions could be found between the pGH and the ryr 1 locus.