A further 35 workers are due to be laid off at Bernard Matthews, the firm forced to slaughter 160,000 turkeys after a bird flu outbreak in February.
A total of 270 workers have been laid off
The poultry firm, which has factories at Great Witchingham in Norfolk and Holton in Suffolk, said the move was due to a fall in demand.
The number laid off from its workforce of 4,500 now stands at 270.
The company said sales had levelled off since the outbreak but were yet to recover significantly.
The turkeys were culled at Bernard Matthews' farm next to the Holton meat products plant.
The company was advised by government vets after the potentially fatal H5N1 strain of bird flu was discovered on 3 February.