Science: The Immortal Bull

At Janesville, Wis. last week, an unusual calf was born on the farm of John and Melford Hill. It was the first calf in the U.S. to be sired by bull semen that had been kept frozen at —110° F. The Wisconsin Scientific Breeding Institute, which supervised the affair, believes that frozen semen will start a kind of revolution in the cattle-breeding business.

The frozen semen system has been used in England with success, and its economics looks promising. Normally, a healthy bull can fertilize two cows a week, but during this period he produces enough semen to fertilize hundreds by artificial...

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