The search for ways to promote growth of farm animals without adding antibiotics to feed has led scientists to an advance toward genetically engineering animals that produce higher levels of a natural growth-promoting protein in their milk. Researchers genetically engineered laboratory mice to produce milk enriched in pig LF, and studied the growth of 10 generations of mice pups fed on the milk. Mice fed LF-enriched milk grew 10-15 per cent faster than those fed on ordinary milk.
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