An All-in, All-out production is a production system whereby animals are moved into and out of facilities in distinct groups. By preventing the commingling of groups, the hope is to reduce the spread of disease. Facilities are normally cleaned and disinfected thoroughly between groups of animals

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Other /More definition:
An All-in, All-out production is a production system whereby animals are moved into and out of facilities in distinct groups. By preventing the commingling of groups, the hope is to reduce the spread of disease. Facilities are normally cleaned and disinfected thoroughly between groups of animals