Genomic selection has revolutionized dairy cattle breeding. Since 2000, assays have been
developed to genotype large numbers of single-nucleotide polymorphisms (SNPs) at …

In its simplest form, longevity is defined as the ability to live a long life. Within the dairy
industry, longevity has been defined and measured in many different ways, and the aim of …

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

A national fertility evaluation was developed based on pregnancy rate, which measures the
percentage of nonpregnant cows becoming pregnant within each 21-d opportunity period …

Substantial increases of 3,500 kg of milk, 130kg of fat, and 100kg of protein per cow per
lactation have resulted from improvements in genetics, nutrition, and management during …

Genetic improvement in sires used for artificial insemination (AI) is increasing faster
compared with a decade ago. The genetic merit of replacement heifers is also increasing …

Reliable biomarkers predictive of productive herd life (time in herd after birth of first calf)
have heretofore not been discovered in dairy cattle. However, circulating concentrations of …

Dairy cattle productive lifespan averages approximately 3 yr after first calving. Changes in
the last decade in reproductive performance, genetic merit, and societal concerns regarding …

Recent research on the transition period (TP) of dairy cows has highlighted the pivotal role
of immune function in affecting the severity of metabolic challenges the animals face when …

The contribution of the calf enterprise to the profit of the dairy farm is generally considered
small, with beef bull selection on dairy farms often not considered a high priority. However …