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In partnership with the RSPCA, the supermarket is phasing out the use of battery production for any of its standard own-label eggs. The retailer, which will sell 140m fewer eggs from battery-farmed hens in the next 12 months, has collaborated with egg suppliers to develop different methods of egg production. Asda claims sales of barn and free-range eggs are growing at a rate of 22%.

RSPCA senior scientific officer John Avizienius said he hoped Asda's policy would force its rivals to follow suit.