I've tried researching, but haven't found an answer to this question yet. When treating laying hens with Terramycin I've been told to discard eggs for 2 weeks. My question is does that mean 2 weeks after the last day of treatment, or 2 weeks after the start of treatment? I checked Pfizer's web site, all it said is that it should not be used on chickens used for meat or whose eggs are used for human consumption! I was told at the feed store where I bought it that it would be fine to use on laying hens. Have I just ruined my laying flock?