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In page Inbreeding:

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As a result of long-term cooperation between USDA and dairy farmers which led to a revolution in dairy cattle productivity, the United States has since 1992 been the world's largest supplier of dairy bull semen.[6] However, US genomic technology has resulted in the US dairy cattle population becoming "the most inbred it's ever been" and the rate of increase in US national milk yield has tapered off. Efforts are now being made to identify desirable genes in cattle breeds not yet optimized by US dairy breeders in order to apply hybrid vigor to the US dairy cattle population and thus propel US dairy technology to even higher levels of productivity.[citation needed]