The blood group factor Kf and allele Kae in the pig.

By means of alloimmune reagents used in the indirect Coombs test and the dextran test a new factor Kf in the K bloodgroup system of pigs was found, controlled by alleles Kacf, Kacef and Kbf. A new allele Kae was also detected. The K system with 6 alleles, 11 phenotypes and 21 combinations of genotypes remains (from the genetic point of view) an open system.