Meet Cosmo, the gene-edited Crispr calf
S. D. McClain,
Cosmo was the grand finale of a series of experiments to create a line of genome-edited cattle tailored for the beef industry. He was designed to produce 75% male offspring.
His due date, March 30, had passed. Alison Van Eenennaam, animal genomics researcher at the University of California-Davis, recalls feeling worried.
The calf’s surrogate mother, Cow 3113, or “Elle,” was dilated, but nothing was happening. Finally, the vets broke the water, put chains on the calf’s legs and pulled him out.
“He had his tongue hanging out of his mouth, and I was so nervous. That would’ve been the worst of all outcomes to lose him then,” said Van Eenennaam.
He lived: 110 pounds, black with a snowy spray on each back leg and soon romping.
But this was no ordinary calf.
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