A surrogate sire bull carrying another male's DNA in its sperm

In a breakthrough that promises to revolutionize the precision breeding of animals, an international team of scientists led by Jon Oatley, a reproductive biologist with Washington State University's College of Veterinary Medicine, has for the first time used the CRISPR gene editing tool to produce infertile animals that become "surrogate sires" and produce sperm containing only donor animal DNA

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