Dr. Cyril Adams and his colleagues at Cambridge University's Animal Research Center have long been harvesting ova from hormone-treated highbred ewes, fertilizing them with sperm from highbred rams and planting them in the wombs of lowbred ewes. This is a handy way to multiply valuable animal strains far faster than nature can do the same job, but when Dr. Adams wanted to improve the breed of South African sheep by shipping the fertilized ova to Natal, he ran into difficulty. They cannot be shipped frozen, and there was no mechanical device that would keep them alive in a natural state.
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