Change of population structure of a completely closed sub-population in Japanese Black Cattle was surveyed using population genetic parameters. Diversity of sires decreased and variance of progeny number per sire increased dramatically during 1960 to 1988. The average coefficient of inbreeding increased in 3 % or more by each decade. Effective population size was only 8 in 1988, that value is about one over thirty three in 1960. From these results, it is concluded that intensive use of a few sires due to the spread of artificial insemination with frozen semen had resulted in loss of diversity of sires and dramatically reduced effective population size.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 144–147, 1994
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