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Abstract
The sire-daughter path of genetic improvement dominates the dam-daughter path. Within-herd management practices intended to enhance genetic progress should thus concentrate on the sire-daughter path. Studies of genetic progress via the sire-daughter path from historic and recent estimates show that rates for milk yield have increased in recent years; however, rates are still only half to two-thirds that theoretically possible from single-trait selection. Perceived importance of linear type traits, registry status, and reproductive management considerations influence genetic merit of service sires. Establishment of herd breeding goals and management of the breeding herd by fertility groups appear to be useful approaches to improve genetic merit of service sires. Impact of proposed changes in sire selection methods on demand for proven bulls and sample sires is discussed.
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