This study was conducted
to investigate the genotypic frequencies and the
effects of M307 and RYR1 on the growth performance
of two major Western pig breeds of Taiwan. It was concluded that the present results suggest that allelic
frequencies of the favorable A allele of M307 in two
major Western pig breeds in Taiwan are higher than
those in European populations. While selection of the
favorable AA genotype at M307 for resistance to E. coli
F18 adhesion resistance may not affect growth performance
traits in Duroc and Landrace pigs, the effect of
RYR1 on growth performance should be monitored during
the selection process.