New Zealand scientists are breeding a herd of cows that produce lower-fat milk after the chance discovery of a natural gene mutation in one animal.
Milk from the cows is also high in health-boosting omega-3 fatty acids and makes butter that spreads as easily as margarine even when chilled, biotechnology company Vialactia said Monday.
Scientists discovered a cow, later named Marge by researchers, carrying the mutant gene in a dairy herd they were testing in 2001, Vialactia chief scientist Russell Snell said.
Vialactia, a subsidiary of the Fonterra Cooperative Group, one of the world's largest milk companies, bought the cow for 300 New Zealand dollars (US$218; euro162) and moved it to a research site.
While she looked like any other Friesian cow, testing revealed that Marge's milk contained about 1 percent fat, compared with about 3.5 percent for whole milk.
Offspring from the cow also produce low-fat milk, showing the genetic trait is dominant, Snell said.
Scientists have yet to isolate the exact chemical pathway responsible for the naturally produced low-fat milk, Snell said.
"Every now and then nature throws up these sorts of things and it was simply a case of us being in the right place at the right time," he said.
The company expects the first commercial herd of cows supplying natural low-fat milk and spreadable butter for the market by 2011.
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