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32 Pennsylvania poultry Agricultural Economics annual egg production average cost average net return average number average total cost Bedford county bird breeds breeds breeds Butler county cent of total cost per dozen cost per layer costs and returns Department of Agricultural Economics and Rural egg prices eggs per layer feed cost flock increased flocks above average flocks of less hours of labor important to costs labor efficiency Lancaster county layer increased LAYER LAYER cost layers per flock layers1 laying flock laying hen lb 2 lb light breed flocks mortality of layers NUMBER EnGs number of eggs number of factors number of layers Pennsylvania poultry flocks Pennsylvania State College physical costs pounds of feed pounds of mash production per layer rate of egg return per hen return per layer returned feed bags returns per dozen Rural Sociology Shell and grit size of flock total returns variation various items