The rabbit kappa-casein encoding gene has previously been shown to possess
two alleles. The two alleles do not differ in their coding region and in th
e accumulation levels of mRNA. However they differ greatly with respect to
their intronic regions. The rearranged regions in the first and fourth intr
ons were found to be inverse and complementary LINE sequences. The A allele
was found to be more frequent in different European breeds. Correlation of
the kappa-casein genotype with the breeding capacity in a New Zealand Whit
e rabbit stock has been examined.