Abstract
Drug residues in blood plasma, egg-white and -yolk have been measured for 3 weeks after 8 days of continuous treatment with sulphanilamide, sulphadimidine, sulphaquinoxaline and pyrimethamine. The results are discussed with reference to physiological data concerning eggwhite and -yolk formation. From this, it is concluded that a withdrawal period of at least 10 days after the disappearance of drug in blood plasma is necessary to avoid residues of drugs in eggs from treated hens.
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