they inject eggs with chems, every egg that goes through the assembly line gets injected with all their little chemical schemes.
Chemicals injected into eggs include lipophilic environmental contaminants like halogenated aromatic hydrocarbons (e.g., PCBs) and polycyclic aromatic hydrocarbons (e.g., benzo[a]pyrene) for toxicity studies, selenium compounds (seleno-methionine or sodium selenite) for nutritional research in poultry, and influenza virus for vaccine production.