Comparison of perfomance between the maternal lines in Tajima strain

The female family lines of Tajima strain in Mikata and Kinosaki areas were investigated. The genetic composition of the existent cows was examined and the relationsips of the composition with inbreeding and meat production ability were examined. (1) One hundred thirty and 40 cows existed in Mikata and Kinosaki area, respectively. (2) The relationships between the existed cow number and a genetic contribution rate and Pr(lost) of founder were weak. The contribution rate of the founders which contributed sire production was higher. (3) Although meat production ability was different by the founders, there were no relations between the ability and the existent cow number. (4) It is suggested that the selection of female family lines would be possible to maintain the genetic diversity in considering the meat production ability and the genetic contribution rates of the founders.