Pedigree file s of males and females for 56,075 Jersey and 1,089,589 Holstein cattle from the Canadian herdbooks were investigated for the occurence of inbreeding of Jersey cows born since 1973 and Holstein cows born since 1982. A rapid recursive algorithm was used to compute inbreeding coefficients. Percentages of inbred cows and average inbreeding of inbred cows were 25.1 and 2.9X for Jersey and 9.7 and 2.6X for Holstein. The average inbreeding of a ll cows was .IX for Jersey and .31 for Holstein.

F. Miglior, E. B Burnside, B. P Sullivan, B. Szkotnicki, B. W Kennedy

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 183–186, 1990
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