Holstein cattle at the UC Davis Dairy Facility. Chromosomes from a legendary bull born in 1962 account for almost 14 percent of the genome in the current Holstein population in the United States. A ...

HUDSON, Iowa — Blake Hansen loves beef, but admits he is quite particular about the quality of meat he chooses to consume. So, when he sampled a steak he could cut with a spoon, he was hooked. "It’s ...

The days of guess work in breeding dairy cattle are gone. Today's DNA sequencing means more productive cows and less pollution. Breeding cattle through artificial insemination began in the 1940’s.

More than 99 percent of Holstein bulls born using artificial insemination in the last decade trace their male lineage to just two bulls born in the 1960s. Efforts to reconstitute two lost male ...