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Journal of Dairy Science Vol. 78 No. 5 1163-1167
© 1995 by American Dairy Science Association ®
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Inbreeding of Canadian Holstein Cattle

Filippo Miglior 1 and Edward B. Burnside 1

1 Centre for Genetic Improvement of Livestock, Department of Animal and Poultry Science, University of Guelph Guelph, ON Canada N1G 2W1

Inbreeding coefficients of >3 million Holstein cows and bulls were computed for the Canadian population. Relative to the population base in 1950, the inbreeding coefficients ranged from 0 to 37.5%. During the period of study, trends for inbreeding increased, except for 1978 through 1986, when inbreeding fell or reached a plateau. More recently, for birth years 1987 through 1990, inbreeding has steadily increased at an annual rate of .07 and .21% for cows and bulls, respectively. The mean inbreeding of AI bulls approached 3% in 1990, the last year recorded.

Key Words: dairy cattle • inbreeding

Submitted on June 10, 1994
Accepted on February 27, 1995




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