Protein-rich milk from modified(cloned) cows could speed dairy processing.

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So that is a 13% increase in the risk of catching a prion disease!!!!

 

Clones to cut cheese costs?Protein-rich milk from modified cows could speed

dairy processing.

27 January 2003

HANNAH HOAG

 

The modified cows produce 13% more protein in their milk than normal cows.©

GettyImages

 

Protein-rich milk from cloned, genetically modified cows could cut cheese-making

costs. Dairy manufacturers would need less milk to make cheddar firm and ice

cream creamy.

 

Two years old and living in New Zealand, the clones produce about 13 percent

more milk protein than normal cows. They carry extra copies of the genes for two

types of the protein casein, key for cheese and yoghurt manufacture1.

 

" The proteins are important. They allow milk to have a high protein content, but

to remain watery, " says study leader Götz Laible of New Zealand biotech company

AgResearch. His team must now find out whether the increase improves milk's

calcium content or its ability to coagulate before they seek approval to sell

the clones to dairy farmers.

 

Most scientists believe that milk from cloned cows is no different to normal

milk. But they are less certain about the safety of milk from genetically

modified cows.

 

It depends on which gene has been added to the cow's DNA, says animal

reproduction specialist Will Eyestone of Virginia-Maryland Regional College of

Veterinary Medicine, Blacksburg. For instance, some cows are altered to produce

pharmaceutical products. A drug could pose a health risk if it seeps into the

milk.

 

Laible's cows might be less worrisome - they don't produce foreign proteins,

just more of natural ones. " You're upping the nutrient value, " says Roberts.

" This is unlikely to be a problem. " But further testing will have to confirm the

milk's safety, he adds.

 

" A lot of cloned milk is being poured down the drain, " says Michael Roberts, an

animal biotechnologist at the University of Missouri-Columbia. Food products

from transgenic and cloned animals, and their progeny, are not legally available

in many parts of the world.

 

The US Food and Drug Administration has yet to issue its guidelines on the

matter. Until then, companies producing cloned cows have volunteered not to sell

their milk.

 

Laible created the high-output cows by inserting casein genes into the DNA of a

cell taken from the 60-day old fetus of a female dairy cow. The researchers then

transferred the nucleus into unfertilized cow eggs. Of the 126 modified embryos,

11 cows survived until after weaning.

References

 

Brophy, B. et al. Cloned transgenic cattle produce milk with higher levels of

ß-casein and k-casein. Nature Biotechnology, published online,

doi:10.1038/nbt783 (2003). |Article|

 

 

 

 

 

 

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