The massive improvement in food production, as a result of effective genetic selection
combined with advancements in farming practices, has been one of the greatest …

Over the past 100 yr, the range of traits considered for genetic selection in dairy cattle
populations has progressed to meet the demands of both industry and society. At the turn of …

Seven years after the introduction of genomic selection in the United States, it is now
possible to evaluate the impact of this technology on the population. Selection differential …

The biological cycles of milk production and reproduction determine dairying profitability
thus making management decisions dynamic and time-dependent. Diseases also negatively …

Selective breeding has been practiced since domestication, but early breeders commonly
selected on appearance (eg, coat color) rather than performance traits (eg, milk yield). A …

The effects of increased pedigree inbreeding in dairy cattle populations have been well
documented and result in a negative impact on profitability. Recent advances in genotyping …

Timed-AI after synchronization of ovulation has become one of the most used reproductive
technologies developed during the past 40 years. Various adaptations of this technology are …

Genomic selection increases accuracy and decreases generation interval, accelerating
genetic changes in populations. Assumptions of genetic improvement must be addressed to …

The intensive selection programs for milk made possible by mass artificial insemination
increased the similarity among the genomes of North American (NA) Holsteins tremendously …

Trends since 1980 for calving age and calving interval, 2 factors that influence herd life,
were examined by parity for 5 breeds of US dairy cattle. Calving data were from cows with …