Discoloration of egg shells from feeding high levels of certain tetracyclines.
D000821:Animal Feed; D000818:Animals; D002751:Chlortetracycline / Q000378:metabolism*; D004032:Diet; D004531:Eggs; D010118:Oxytetracycline / Q000378:metabolism*; D011200:Poultry; D013752:Tetracycline / Q000378:metabolism*
D013752:Tetracycline; D002751:Chlortetracycline; D010118:Oxytetracycline