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...Poultry and pig science chicken layer farming management production factors breed selection health control housing system feeding programs egg biosecurity sanitation hygiene transportation human resource development economical analysis rhode island red hen plyymoth rock of layers laying birds stagesoflife pulletchicks day oldtoweeks fedonchickmash growingstage weeks pointof cage toweeks lay pol fedongrower smash stage fedonlayer birdsshouldbetransferredtothelayingquarters deeplitter or battery cages at to old the pen must have beencleaned disinfectedandmadetorestforaboutdays birdsaretransferredinwell aeratedcrates inthemorningor evening should be without feed for hours before beentransferred...