Abstract
Abstract Reasons for disposal of 9883 United States and 692 Canadian artificial insemination sires were evaluated to compare frequencies of culling for undesirable type (2.3 and 7.9%) of offspring and for low milk yield (15.3 and 16.3%). Frequencies by country-reason were heterogeneous. Selection pressure apparently has been greater on Canadian artificial insemination sires for desirable type of daughters than on United States sires.
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