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There is no regulation requiring meat products to have a calendar date.

Greek yoghurt could be an unlikely source of sustainable jet plane fuel, researchers have shown.

Scientists have found a way to turn waste products from yoghurt production into a raw material for biofuel and livestock feed additives.

Department for Transport figures show that aircraft and lorries powered by waste fuels could use up to 90 per cent less carbon than traditional fossil fuels.

Trials of sustainable jet fuel made from waste materials have already taken place in Europe and North America.

Both compounds qualified as 'green antimicrobials' that could be added to livestock feed to replace standard antibiotics.

Lead researcher Dr Lars Angenent, from Cornell University, New York, said: 'To be sustainable, you want to convert waste streams where they are made, and upstate New York is where the cows are, where the dairy farmers are, and where the Greek yoghurt craze began in the United States.'That's a lot of acid whey that right now has to be driven to faraway locations for land application, but we want to produce valuable chemicals from it instead.'He pointed out that while the agricultural market was smaller than the fuel market, it had a 'very large carbon footprint'.'Turning acid whey into a feedstock that animals can eat is an important example of the closed cycles that we need in a sustainable society,' he said.

Since 1972, FSIS has required poultry products to include a date of packing, either as a calendar date or a code ( 9 CFR Section 381.126).

FSIS has permitted the use of a sell-by or use-by date in lieu of the required date of packing.

For the study, bacteria were used to turn the cocktail into an extract containing the useful compounds caproic acid and caprylic acid.

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