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Journal of Dairy Science Vol. 71 No. 5 1346-1354
© 1988 by American Dairy Science Association ®
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Genetic Relationship Between the United States and Canadian Holstein Bull Populations1

G. Banos2 and R. A. Cady

Department of Animal and Nutritional Sciences, University of New Hampshire, Durham, NH 03824

ABSTRACT

The average additive genetic relationship and degree of connectedness between American and Canadian Holstein AI bull populations were estimated. This project was undertaken to determine the feasibility of a joint United States-Canadian sire evaluation to estimate genetic base differences between the two countries‘ Holstein bull populations. Data were provided by USDA and Agriculture Canada for bulls evaluated in each country. Bulls were designated as American, Canadian, or dual national origin based on their country of registration and national origin of their parents. A total of 13,079 American, 1683 Canadian, and 256 dual origin bulls were included in the inverse relationship matrix. When both sire and maternal grandsire relationships were included in the matrix, there were 174 disconnected groups; however, 99% of the American bulls and 97% of the Canadian bulls were in a single group. The average ai, j between the American and Canadian population was 4.6 x 10–5. Despite the low average additive relationship between the two national populations, the high degree of connectedness in the inverse relationship matrix, when using both sire and maternal grandsire relationships, suggests sufficient genetic ties between the two populations to conduct a meaningful joint sire evaluation.

FOOTNOTES

1 Scientific Contribution Number 1489 from the New Hampshire Agricultural Experiment Station.

2 Department of Dairy Science, 1675 Observatory Drive, University of Wisconsin, Madison 53706.






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Copyright © 1988 by the American Dairy Science Association ®.