This work was carried out to get some informations about blood types and their researches, involved blood stock and genetic identification. Horses examined were total 55 heads of sire, mare and their progeny in Korean Horse affairs Association. Albumin and phenotypes of 26 mare were examined. The appearance of phenotype AA, BB, AB, was 1, 18, 7 respectively. The gene frequency of albumin A was 0.17 and albumin B was 0.76. The appearance of phenotype AA, BB, Ab in 29 progeny was 1, 16, 12 respectively. The gene frequency of albumin A was 0.24 and albumin B was 0.76. The gene frequency of gene A was higher than their parents. Identification of the relationship between parents and their progeny was also examined. 4 of type AB between AA and BB, 4 of type BB between BB and BB, 13 of type AB between BB and AB were borned. In third case, all of progeny was type AB. This results suggest positive relationship between them

This study was carried out to evaluate the possibility of sex preselection by gradients methods using bovine serum albumin in rabbits. Artifical insemination was performed with sperm from the top and bottom layer of rabbit semen separated by bovine serum albumin gradients. Various characteristics of separated sperm, and the conception rate secondary sex ratio at artificial insemination with separated sperm were compared. The sperm from the bottom layer showed significantly high value in motility, percent of normal sperm and progressive motility as compared with control sperm and the sperm from the top layer. The conception rate of sperm from the bottom layer was higher than that of the top layer. But secondary sex ratio was not altered by this methods