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_ _‘_ 12 weeks abnormally advertisement affected birds Agricultural Experiment Station analyzed annual applied baby chicks basis bear in mind breeding ﬂock Broiler capacity to live chickens clean conditions control program desired qualities Early sexual maturity effective egg production egg shape egg-laying ability egg-laying contests emphasis enterprise eradicated pullorum farm ﬁrst ﬁve characters ﬁve inherited Folks Free from pullorum fully feathered genetic graded gram growers hatching Hays hens High persistency houses important incubation individuality infected intensity Iowa Laboratory Lack laying long loss from leukosis males Massachusetts mate Meat Production Nebraska poultry Non-broody Non-pause pedigree persistent culling possible poultry breeders poultry busi Poultry Disease Poultry Improve poultry meat pounds principles problem Pullets Pullorum disease range paralysis rapid rate research resistance rigorous selection seven per cent shank Shell texture special specialists stock strain summarizes susceptibility Table trapnest value variability weighed Winter pause